A little host for jconvolver
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A little host for jconvolver


Jc_Gui is a simple Host wrap around jconv/jconvolver

======================= Building Jc_Gui from source code

---- Build environment

Jc_Gui uses 'waf' for the build environment. The simplest and fastest way to build Jc_Gui is given below:

cd Jc_Gui_source_directory ./waf configure ./waf build sudo ./waf install

By default, this will install Jc_Gui and related files in the /usr/local filesystem, e.g. /usr/local/bin.

The installation prefix can be provided at configure time, e.g.:

./waf configure --prefix=/usr ./waf build sudo ./waf install

Thus, Jc_Gui will be installed in /usr/bin.

---- Dependencies

To compile and run properly Jc_Gui needs the following extra packages (runtime binaries/libraries and development packages):

GTK+-2.0 >= 2.12.0 libsndfile >= 1.0.17 JACK (jackd, libjack, and their development packages) >= 0.109.1

By the way, most package managers usually list development packages as 'packagename-dev', e.g. libsndfile-dev.

==================== Startup options

---- From the command line

Jc_Gui provides a few user options at startup. They can be set in two ways. From the command line, Jc_Gui can be invoked with the usual -h or --help option. The following help message is displayed:

$ Jc_Gui --help

Jc_Gui usage All parameters are optional. Examples: Jc_Gui Jc_Gui -i system:capture_3 -i system:capture_2 Jc_Gui -c -o system:playback_1 system:playback_2

-h [ --help ]         Print this help
-v [ --version ]      Print version string and exit

JACK configuration options: -i [ --jack-input ] arg Jc_Gui JACK input -o [ --jack-output ] arg Jc_Gui JACK outputs

The options should be self explanatory but for the sake of clarity, a few extra points are worth mentioning here.

JACK options:

By default, Jc_Gui will not auto-connect to any JACK system ports unless the latter are explicitly provided from the command line. If you started Jc_Gui as follows:

$ Jc_Gui

You can connect the Jc_Gui JACK ports to e.g. system ports from Patchage (drobilla.net/software/patchage/) or the QJackCtl (qjackctl.sourceforge.net/) connection window.

In the following example system port names are given:

$ Jc_Gui -i system:capture_1 -i system:capture_1 -o system:playback_1 system:playback_2

At startup Jc_Gui will autoconnect to these system ports

---- From SHELL variables

Jc_Gui offers the possibility to make some of these options more "permanent" thanks to SHELL variables. These variables are:


Those can be defined in your $HOME/.bashrc file. Here's a typical setup:

export Jc_Gui2JACK_INPUTS1=system:capture_1 export Jc_Gui2JACK_INPUTS2=system:capture_1 export Jc_Gui2JACK_OUTPUTS1=system:playback_1 export Jc_Gui2JACK_OUTPUTS2=system:playback_2

For (t)csh shells, the following can be placed in $HOME/.cshrc

setenv Jc_Gui2JACK_INPUTS1 system:capture_1
setenv Jc_Gui2JACK_INPUTS2 system:capture_1
setenv Jc_Gui2JACK_OUTPUTS1 system:playback_1 setenv Jc_Gui2JACK_OUTPUTS2 system:playback_2

You can connect Jc_Gui also over a integratet connection widget.

==================== Keyboard shortcuts

Jc_Gui benefits from keyboard shortcuts for most of its operations. At the moment (svn@200), the following keyboard shortcuts are available:

  • Engine menu:

  • Audio engine play : Space
  • Audio engine stop : Space
  • Quit Jc_Gui : Ctrl+Q
  • Presets menu :

When Jc_Gui is launched, it will browse the $HOME/.Jc_Gui/Jc_Guiprerc file and store the found presets in its menu. The preset handling is quite versatile and let you do some useful things:

  • Load a preset : 1, 2, 3, ... (note (ii))
  • Save a preset : Ctrl+1, Ctrl+2, etc (note (ii))
  • Create a new preset : Ctrl+P (insert a valid name, spaces will be replaced by '-')
  • Recall main setting : S (see note (iii))
  • Save as main setting : Ctrl+S (see note (iv))

Submenu "More Preset Action" :

  • Cycle to next preset : Page Down (very useful)
  • Cycle to prev preset : Page Up (very useful)
  • Save active preset : Alt+S
  • Rename active preset : Alt+R
  • Delete active preset : Delete
  • Delete ALL presets : Ctrl+Shift+D (gives a warning)


(ii) If you have more than 9 presets, shortcuts will be disabled

  • About menu:

  • About display : Ctrl+A

==================== JACK startup when JACK isn't running

Jc_Gui will pop up a JACK start dialog window if it finds that jackd is not running.

You can choose to activate JACK or exit Jc_Gui. Note that the supported methods for starting JACK are (by preference order):

1- QJackCtl --start 2- Use of $HOME/.jackdrc

Jc_Gui does not support jackdbus or any JACK start method other than the two listed above.

=========== Extra information

=> jconv

Jc_Gui use the excellent jconv convolution engine developed by Fons Adriaensen, available here:


Jconv can be configured from Jc_Gui. However, due to design restrictions jconv can only be configured when not running. Despite this restriction, it is possible to save particular jconv settings. The user can recall these presets from the main Load Preset menu item.

Note: When trying to load an impulse response WAV file (aka an IR file), Jc_Gui will check for spaces in the filename and remove them if present. You can also resample the file to the sample rate used by JACK.



Enjoy! :)

If you encounter problems building or running Jc_Gui, please inform us.