






Table Of Content
Introduction
Description
Blue Cat's Widening Triple EQ is the "Widening" (Mid/Side) version of the Triple EQ shapeable filter / equalizer: it is a three bands real time semi-parametric mid/side equalizer. It lets you control the low, medium and high gains of the mid (mono) and side (stereo) components of your audio signal independently, with a custom filter shape. It enables you to manage the wideness of a stereo signal for any frequency. With the ability to control the center of the M-S matrix, it is possible to adjust the spectrum of a sound anywhere in the stereo field.
The plugin provides instant visual feedback of your settings thanks to the included graph. The overlayed controls lets you shape the filter easily. The mid and side channels responses can be linked together in multiple ways (with a mirroring capability) for easier balance of frequencies.
For more information about the core technology of the filters, please read Blue Cat's Triple EQ plugin's description. Additional information about stereo widening and narrowing with mid/side processing can be found in this mid-side processing paper.
Main Features
- True WYSIWYG 3 bands Mid/side semi-parametric equalizer / shapeable filter.
- +-40 dB range for each band with customizable effective range.
- Automatic gain compensation.
- No latency.
- Real time display of the frequency response with precise measurement and zooming capabilities.
- On-graph filter shape control.
- Window Opacity Control: make the plugin window transparent.
- Supported platforms: Mac-AU, Mac-VST, Windows-DX, Windows-VST.
- Native DSP code for optimal performance.
- Skinnable user interface.
- Smooth Update: silent (zipper-free) parameters update.
- Full automation support (all parameters can be automated, with smooth and continuous update)
- No CPU load on idle: when the plugin is fed with silence, the processing smoothly shuts down, to optimize the CPU usage of your Digital Audio Workstation.
- Real time MIDI control with advanced settings (MIDI channel and CC numbers, with complete response curve control) and MIDI learn.
- Smooth Bypass: activate/deactivate the plugin with absolutely no noise.
- Undo/Redo.
- Import/Export presets in a host independent format.
- Any sample rate supported.
System Requirements
PC
- Microsoft Windows XP, Vista or Windows 7.
- Any DirectX / VST compatible host software .
Mac
- An Intel or PowerPC processor.
- Mac OS X Leopard (10.5) or Snow Leopard (10.6).
- Any VST / Audio Unit compatible application.
For more information about supported platforms, see our FAQ.
Installation
Blue Cat Audio plugins cannot be run standalone, they require a host application (see the System Requirements chapter for more information). Depending on which host application you use, you might need to install the plugins in different locations.
Windows
Install
Both DirectX and VST versions provide an install program. Follow the steps of the wizard to install the plugin on your machine. During the installation you will be asked where you want the plugin(s) to be installed. For the VST version you should install the plugin inside the VST plugins folder used by your host application(s). The default path set in the installer should work for most applications, but you should check your host software documentation to know where it looks for VST plugins.
Some applications will not automatically rescan the new plugins, so you might have to force a refresh of the plugins list.
Upgrade
When a new version of the plugin is released, just launch the new installer: it will update the current installation.
Mac
Install
On Mac the plugins are available as drive images. After download, double click on the file to open it. You can then drag and drop the plugin file(s) to the shortcut that is provided within the image. It will install the plugin(s) for all users on the machine.
In case you do not have admin rights on your Mac or if you want to install the plugin(s) to another directory, just copy the files to the appropriate location. If required, more information is available in the README.txt file that is included in the package.
Upgrade
When a new version of the plugin is released, open the new image and copy the files over the previous ones. The new version will replace the older one.
Using Blue Cat's Widening Triple EQ
The User Interface
The Widening Triple EQ effect is delivered with two skins with minor layout changes. The controls are blue for the mid (mono) channel and pink for the side (stereo) channel.

Control the gain of the low frequencies (bass).
Control the gain and frequency of the mid frequencies filter. The bandwidth can also be changed with the mouse wheel or by double clicking on each cat paw.
Control the gain of the high frequencies (treble).
Control the overall gain (offsets the whole frequency response).
Auto gain mode: when auto gain mode is on, the overall gain of the plugin is automatically adjusted according to the maximum filter gain to keep the frequency response around 0dB.
The position of the mouse cursor is shown here to help you adjust the values of the filters frequencies and gains.
Adjust the bandwidth of the mid filter (auto adjusts the cutoff frequencies of the high and low shelf filters).
Choose the range of the graph and controls: you can zoom to your prefered value by clicking on the controls below the graph or by dragging the slider on the left. Zooming the graph also zooms all controls, adjusting the range of gains of the filters.
The opacity of the plugin window can be changed by moving the slider (The result depends on the host application), in order to make it transparent.
Smooth bypass the plugin: turns the plugin on or off silently.
Show/Hide controls for a channel: it controls the visibility of the filter controls on the graph.
Link channels: when the link is on, moving the control for a channel automatically adjusts the controls for the other channel, according to the options set on (13) and (14)
Absolute/Relative: in absolute mode the values of the controls for both channels are identical, whereas in relative mode only controls variations are reported on the other channel (letting you setup a different EQ on each channel and then apply linked modifications for example).
Mirror mode: in mirror mode, the gain value for both channels are reversed. It is very handy when you want to use the EQ as a balance between channels.
Adjust the center for the Mid/Side Matrix. Lets you decide where the mid channel correction takes place in the stereo field. More about this topic can be readin the following article: MidSideProcessing.pdf
The various elements of the user interface (knobs, sliders, button...) are simple and intuitive to operate, but more information about how to interact with them is available in the "Plugins Basics" chapter of this manual.
Operation
Once your have read our mid-side processing paper, using the Blue Cat's Widening Triple EQ plugin is straightforward: draw your EQ curve for each channel (mid or side) using the controls and you are done! Here are however a few tricks to help you get the best out of this particular EQ.
Dual channels
With no link between the mid and side channels you can use the plugin to shape the spectrum of the center and sides of a stereo track independently. You can for example choose to reinforce bass on the center of a mix, and boost the highs on the sides to make it feel wider without yet making it too artifical.Single Channel
When the M/S link is enabled and its mode set to "absolute", the plugin behaves just like a single channel EQ: both channels are processed with the exact same settings.Multi Bands Widener/Narrower
If you enable the Mid/Side link in absolute mode and use the "Mirror" function the plugin will behave as a multiple bands widening/narrowing balance. In this case you can choose to mask the side band controls and only use the mid controls. Pushing the cursor up will push the sound to the mid channel (narrowing the sound), whereas moving down will widen the stereo signal.Apply the effect at a chosen position in the stereo field
If you use only the mid EQ, you will by default modify the center of the stereo field. Thanks to the "center" parameter it is possible to adjust exactly where in the stereo field you want the effect to occur (and not only in the middle).Need more Bands?
If you need more bands you can use several instances of the plugin in series. You will then be able to control more frequency bands at a time!Use Automation
Since this plugin integrates the smooth update technology, you can use and abuse of automation to create time varying widening or narrowing filter effects. It is also possible to control these variations in real time thanks to the ability of the plugin to be controlled via MIDI, as shown in our MIDI Wah tutorials (see the tutorials section).Blue Cat Audio Plugins Basics
This chapter describes the basic features that are common to all our plugins. If you are already familiar with our products, you can skip this part.
User Interface Basics
About Skins
Like all Blue Cat Audio plugins, Blue Cat's Widening Triple EQ uses a skinnable user interface. It means that the appearance and behavior of the user interface can be entirely customized.
Especially with third party skins, the experience may be very different from the one offered by the default skins that we provide and which are described later in this manual. Our plugins and our skinning engine however have several standard features that will be available whatever your favorite skin. This is what this chapter will describe.
More information about custom skins can be found in the skins section.
Main Toolbar and Menu
Menu
If you right click on the background of the plug-in, the following pop-up menu appears:

The description of the commands associated to each menu item are available below.
Toolbar
In some skins, an optional toolbar gives you access to the some of the functionalities of the main menu.
| Icon | Name | Function |
|---|---|---|
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Menu | Open the main menu |
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Undo | Undo |
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Redo | Redo |
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Load | Load Preset |
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Save | Save Preset |
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Manual | User Manual |
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About | About |
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Website | Opens our website |
Commands
The Commands available from the main menu or the toolbar are:
- Set Preset Skin: change the skin for the current preset.
- Use Global Skin: use the skin defined in the global settings for the current preset. This item is enabled only if a skin has been defined for the current preset.
- Undo/Redo: undo or redo the latest modifications. This includes all changes made to the current preset settings.
- Load Preset: load preset from file.
- Save Preset: save current preset to file.
- Presets Settings: open the presets settings window. It enables you to change the skin and MIDI settings for the current preset.
- Global Settings: open the global settings window. It enables you to change the skin and MIDI settings that are used by default in all instances of the plugin.
- User Manual: open this user manual.
- Check Updates: check the updates for this software on our website.
- Get More Skins: get more skins for this software.
- About: displays the “about” dialog box.
MIDI control
Blue Cat's Widening Triple EQ can also be remotely controlled via MIDI using MIDI CC ("Control Change") messages if your host application supports it. It is possible to customize the channel, control numbers and range used for each parameter in the MIDI settings panel available from the main menu (see the Plugin Settings chapter for more details).
Controls
Examples
Here are a few examples of typical controls you will encounter in the user interface of our plugins:
| slider | slider | knob | button | Text control |
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Interacting with Controls
You can interact with the controls of the plug-in interface either with the mouse or the keyboard.
Setting the keyboard focus on a control (so that it reponds to key strokes) may be automatic (when you pass the mouse over it it gets focus) or manual (you have to click on the control to set the focus on it). Note that all host applications behave differently regarding keyboard handling. In some applications you may not be able to use all keys described later in this manual to interact with our plugins. It is usually made obvious to you to know the active surfaces of the skin (the places where you can click with the mouse): the mouse cursor usually changes when you can do something on a control. In the default skins delivered with the plug-in, the cursor changes to a small hand or an arrow to tell you when your mouse is over an active control.
Mouse
Various mouse movements will let you interact with the controls:
| Mouse Interaction | Action |
|---|---|
| Left Click | Acquire focus and start dragging or push (button) |
| Left Click + Alt Key | Set the value to default |
| Left Double Click |
Acquire focus and launch the “fine
tuning” edit box (except button):
![]() |
| Right Click | Set the value to default |
| Mouse Wheel | Increment or decrement the position (focus required) |
| Mouse Drag | Change the control position depending on mouse movement (except button) |
Keyboard
All control widgets support the following keys (note that some of them are caught by the host and thus never forwarded to the control. For example in Steinberg Cubase SX you cannot use the arrow keys to control the plugin):
Keys Common to All Controls
| Key | Action |
|---|---|
| Up Arrow | Small increment of the position (up or right) |
| Down Arrow | Small increment of the position (down or left) |
| Left Arrow | Same as Down Arrow |
| Right Arrow | Same as Up Arrow |
| Page Up | Large increment of the position (up or right) |
| Page Down | Large decrement of the position (down or left) |
| + | Small increment of the value of the control |
| - | Small decrement of the value of the control |
| d | Set to default value (same as mouse right click) |
| e |
Opens the 'fine tuning' window to precisely
set the parameter:
![]() |
| SHIFT | When the key is down, the fine tuning mode is on, and you can modify the value with better precision when moving the mouse, the mouse wheel or using the keyboard. Just release the key to get back to the normal mode. |
Keys Specific to Buttons
| Key | Action |
|---|---|
| Enter | Pushes the button |
More
Check our online tutorial for more screenshots and more examples of our plugins user interfaces.
Blue Cat's Widening Triple EQ Parameters
All parameters described below can be automated and controlled via MIDI if your host application supports it. You can precisely define this behavior in the settings panels described later in this manual.
|
Param id |
Name |
Unit |
Description |
|---|---|---|---|
|
dsp.input0 |
Bypass |
|
Bypass the effect. |
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dsp.input1 |
Center |
|
Position of the virtual center for Mid/Side channels computation. -100% is left and +100% is right. |
|
dsp.input2 |
Gain (M) |
dB |
Main gain of the mid channel. |
|
dsp.input3 |
Frequency (M) |
Hz |
Center frequency of the mid channel mid band filter. This also adjusts the cutoff frequencies of the low and high shelf filters automatically. |
|
dsp.input4 |
Bandwidth (M) |
Octave |
Bandwidth of the mid channel mid band filter. This also adjusts the cutoff frequencies of the low and high shelf filters automatically. |
|
dsp.input5 |
Low (M) |
dB |
Gain of the mid channel low shelf filter |
|
dsp.input6 |
Mid (M) |
dB |
Gain of the mid channel mid band filter |
|
dsp.input7 |
High (M) |
dB |
Gain of the mid channel high shelf filter |
|
dsp.input8 |
Gain (S) |
dB |
Main gain of the side channel channel. |
|
dsp.input9 |
Frequency (S) |
Hz |
Center frequency of the side channel mid band filter. This also adjusts the cutoff frequencies of the low and high shelf filters automatically. |
|
dsp.input10 |
Bandwidth (S) |
Octave |
Bandwidth of the side channel mid band filter. This also adjusts the cutoff frequencies of the low and high shelf filters automatically. |
|
dsp.input11 |
Low (S) |
dB |
Gain of the side channel low shelf filter |
|
dsp.input12 |
Mid (S) |
dB |
Gain of the side channel mid band filter |
|
dsp.input13 |
High (S) |
dB |
Gain of the side channel high shelf filter |
Note: the param id field is used when designing a new skin. See the skins section of this manual for more information.
Blue Cat's Widening Triple EQ Curves
The Widening Triple EQ plug-in also provides visual feedback about the response curve of the equalizer with output curves:
|
Curve id |
Name |
Description |
|---|---|---|
|
dsp.output_curve0 |
Frequency Response (M) |
Global frequency response of the equalizer for the mid channel. |
|
dsp.output_curve1 |
Frequency Response (dB) (M) |
Global frequency response of the equalizer (decibels) for the mid channel |
|
dsp.output_curve2 |
Low Frequency Response (dB) (M) |
Frequency response of the low pass filter for the mid channel. |
|
dsp.output_curve3 |
Mid Frequency Response (dB) (M) |
Frequency response of the mid band filter for the mid channel. |
|
dsp.output_curve4 |
High Frequency Response (dB) (M) |
Frequency response of the high pass filter for the mid channel. |
|
dsp.output_curve6 |
Frequency Response (S) |
Global frequency response of the equalizer for the side channel. |
|
dsp.output_curve7 |
Frequency Response (dB) (S) |
Global frequency response of the equalizer (decibels) for the side channel |
|
dsp.output_curve8 |
Low Frequency Response (dB) (S) |
Frequency response of the low pass filter for the side channel. |
|
dsp.output_curve9 |
Mid Frequency Response (dB) (S) |
Frequency response of the mid band filter for the side channel. |
|
dsp.output_curve10 |
High Frequency Response (dB) (S) |
Frequency response of the high pass filter for the side channel. |
Note: the curve id field is used when designing a new skin. See the skins section section for more information.
Plugin Settings
In addition to the controls offered in the main user interface, Blue Cat's Widening Triple EQ has various settings that let you fine tune the behavior of the plugin. You can choose to change these settings either for the current preset or globally for all instances of the plugin.
The Global Settings Window
The settings available in this window apply to all instances of the plug-in, for all presets. Consider these settings as “default” settings.
Global Skin
You can change the default skin for all instances of the plug-in: write the skin file path in the text edit box or click on the button to open a file chooser dialog. If you have several instances of the plug-in opened in your session, you will have to re-open the user interfaces of these plug-ins to see the skin change.

Global MIDI Input Settings
For each parameter you can define a default MIDI channel and CC number. You can then control the plug-in with an external MIDI controller or one of our plug-ins that generate MIDI messages.
The following settings are available for each plug-in parameter:
- Channel: MIDI Channel for the parameter control. If set to 0, the plug-ins will accept Control Change Messages from all MIDI Channels (MIDI Omni mode).
- CC: Control Change Number.
- Learn: click on this button to activate the MIDI learn functionality. When it is activated, you can move your MIDI controller, and the plug-in will automatically set the MIDI Channel and CC Number.
- Enable MIDI: enable/disable the MIDI control of the parameter.
- Response: response curve of the MIDI control: from very fast to slow control.
- Min: minimal value of the parameter when MIDI controlled.
- Max: Maximum value of the parameter when MIDI controlled.

Note: if the Min value is higher than the Max value, the response curve will be reversed: increasing the MIDI controller value will decrease the parameter value.
Note: if you double click on the parameter text control boxes for the max and min values, a “fine tuning” edit box will appear and let you change the min and max values with more precision:

The Current Preset Settings Window
This window lets you change the settings for the current preset of the current plug-in only.
Preset Skin
You can choose to use the global skin setting or to change the skin for the current preset. This way you can have different skins for different instances of the plug-in in the same session in order to differentiate them.

Preset MIDI Input Settings
Use the global settings or override them for the current preset. The parameters are the same as for the global MIDI input settings.

About Skins
Blue Cat's Widening Triple EQ integrates Blue Cat's skinning engine that allows you to customize the user interface. You can download new skins for your plug-in at the following address:
If you don't find a skin that fits your need or if you want a really custom one, you can choose to create your own skin.
Changing the Skin
You have two ways to change the skin of your plug-in: you can change the default (or 'global') skin in the global settings, or change the skin for the current preset only (either in the preset settings page or from the main menu). The global skin applies to all plug-in instances, whereas the current preset skin only applies to the current preset of the current plug-in instance.
See the main menu for more information abour how to access these options.
On some hosts the plug-in window won't resize automatically when you choose a skin with a different size. In this case, just close the window and re-open it: it will be displayed with the right size.
Create a Custom Skin
You can create custom skins for your plug-in in order to adapt it to your exact needs. You can change its look and feel and make it completely integrated in your virtual studio!
Just read the Blue Cat's Skinning Language manual and download the samples for the tutorial on http://www.bluecataudio.com/Skins. You can get ready to create your own skins in a few minutes.
You can then share your skins on our website.
FAQ
Plug-ins Formats
Here is a list of host software and the version we recommend you to use. Many other applications are supported, check your application user manual to choose the best version (AU stands for "Audio Unit" and DX for "DirectX"):
| Host Application | Plug-in Version |
|---|---|
| Cakewalk Products (Sonar, Project5...) | DX |
| Sony Products (Vegas, ACID, Soundforge) | DX for old versions, VST for new |
| Steinberg Products (Cubase, Nuendo, Wavelab) | VST (Mac or PC) |
| Ableton Live | VST (Mac or PC) |
| Adobe Audition | any |
| EnergyXT | VST |
| Magix Samplitude | VST |
| Digidesign Pro Tools | RTAS if available, any otherwise (RTAS adapter required) |
| Apple applications (Logic Pro, Logic Express, Garage Band...) | AU |
| ... |
Installation
Most software you can purchase on this website is plugins for host applications. It means you need another application to use it. See the "Plugin Formats" section in this FAQ for more information.
First check that you application supports DirectX, Audio Unit or VST plug-ins.
If you are using the DirectX version, check that your host application supports DXi plug-ins (MIDI enabled DirectX plug-ins). If it does not, it may remove it from the DirectX plug-ins list (some applications such as Sony Vegas 5 and Cool Edit Pro are known to do this). In this case, use our DXi Manager free utility and disable the MIDI capabilities of the plug-in. You may need to reinstall the software again before it shows up into your host application. For more information about this topic please read our DXi in Sony Vegas tutorial (it is applicable to other applications than Sony Vegas).
If you are using the Direct X version and your host application supports DXi, check that the plug-in does not appear in the 'virtual synth' or 'synthesizers' category. If you wish not to use the MIDI capabilities of the plug-in and use it as a regular Direct X plug-in, you can download the freeware DXi Manager and disable the MIDI capabilities of the plug-in.
Our plugins require several additional files for default settings, skins and miscalleanous data. We provide an installer for our customers convinience. Our installers do not modify the system settings settings or the Windows registry, except for the DirectX versions registration. Our installers won't harm your system.
Software Version
Upgrade
Automation
More...
This manual only covers the basics of Blue Cat's Widening Triple EQ. Our website offers many additional resources for your Blue Cat's Widening Triple EQ plugin and is constantly updated, so keep an eye on it! You will find below a few examples of available resources.
Extra Skins
We encourage our customers to propose their own skins for our products and we often propose alternative skins to let you choose the one that best suits your needs. You can check Blue Cat's Widening Triple EQ skins page to get the latest skins.TSV Blue
![]() | Product: Widening Triple EQ Description: Author: TSV (www.tsvdesign.net) Download: Skin_TSVBlue.zip |
TSV Dark
![]() | Product: Widening Triple EQ Description: Author: TSV (www.tsvdesign.net) Download: Skin_TSVDark.zip |
TSV Pumpkin
![]() | Product: Widening Triple EQ Description: Author: TSV (www.tsvdesign.net) Download: Skin_TSVPumpkin.zip |
TSV Pumpkin 2
![]() | Product: Widening Triple EQ Description: Author: TSV (www.tsvdesign.net) Download: Skin_TSVPumpkin2.zip |
TSV Stone
![]() | Product: Widening Triple EQ Description: Author: TSV (www.tsvdesign.net) Download: Skin_TSVStone.zip |
Tutorials
Many Tutorials are available on our website. They cover a wide range of topics and host applications. You will find below a list of tutorials that are related to the Blue Cat's Widening Triple EQ plugin. An updated list is also available online.
Tutorial - Using DXi plug-ins in Sony Vegas
![]() | This tutorial will teach you how to use any DXi plug-in in Sony Vegas: Sony Vegas does not support MIDI automation, so if your plug-in supports the MIDI Dxi protocol, it is removed from the plug-ins l...[Read More...] |
Tutorial - Export Plugin Presets to Share them with the Community
![]() | This tutorial shows you how to export your presets in order to share them with the community on the Blue Cat Audio website. This tutorial uses Blue Cat's Stereo Triple EQ for the demonstration bu...[Read More...] |
Tutorial - Getting Started with Plugins User Interface
![]() | Get used to the user interface features of Blue Cat Audio products! They have been designed for an optimal workflow, so here are the tips and tricks to save time. All these functionalities are explain...[Read More...] |
Tutorial - Using MIDI Control in Sonar
This tutorial will help you understand how to use parameters MIDI control in Cakewalk Sonar. It is applicable to any DXi plug-in (MIDI enabled DirectX plug-in)....[Read More...] |
Tutorial - Create an original MIDI Controlled Stereo Wah Pedal
![]() | In this tutorial you will learn how to create an original Wah pedal-like stereo effect: the wah effect will move from the sides of the stereo field to the center when you push your foot controller. As...[Read More...] |
Tutorial - Mid Side Processing
![]() | Mid / Side processing explained. Download this tutorial as a pdf file ...[Read More...] |
Tutorial - How to Use the Free Presets Available on this Website
![]() | This tutorial shows you how to get and load free presets for your favorite Blue Cat Audio plugin. This tutorial uses Blue Cat's Dynamics for the demonstration but is applicable to all our plugins...[Read More...] |
Updates
As you can see in the history log below, we care about constantly updating our products in order to provide you with the latest technology available. Please visit often our website to check if Blue Cat's Widening Triple EQ has been updated, or subscribe to our Newsletter to keep you informed with the latest news about our products.
Versions History
| 2009/05/05 | V3.21 |
| Mac VST update: fixed incompatibility issues with Cubase 5 on Mac. | |
| 2009/03/09 | V3.2 |
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| 2008/05/06 | V3.1 |
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| 2008/04/14 | V3.0 |
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| 2006/11/29 | V2.1 |
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| 2006/09/27 | V2.0 |
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| 2006/06/06 | V1.0 |
| First release. |
See you soon on www.bluecataudio.com!











