evoctl

Linux equivalent of the Audient EVO Mixer for their EVO audio interfaces.

The application allows the user to control the levels for low-latency monitoring of the hardware and software inputs.

The goal of the project is to be able to control all the parameters which are not available on the interface itself - not to make a complete clone of the Audient UI.

Screenshot

Usage

This program detaches the kenel driver and configures the audio interface. The recommended workflow is therefore:

1. Make sure Jack is stopped
2. Start evoctl
3. Configure the low-latency routing for your session
4. Exit evoctl
5. Start Jack

At the moment, it is not possible to re-configure the low-latency routing while Jack is running.

System setup

To use the program without sudo, create the file /etc/udev/rules.d/70-audient.evo.rules with the following content:

SUBSYSTEM=="usb", ATTR{idVendor}=="2708", ATTR{idProduct}=="0006", MODE="0666"
SUBSYSTEM=="usb", ATTR{idVendor}=="2708", ATTR{idProduct}=="0007", MODE="0666"

Download

No binary releases are available so the program must be built fron source - see below.

Build

The following commands are used to build the project:

git clone http://github.com/soerenbnoergaard/evoctl
cd evoctl
git submodule init
git submodule update
make

The output will be an executable, evoctl in the src/ directory.

References

Other people have also been looking into controlling Audient interfaces from Linux:

• audient-evo-linux-tools
• mymixer

Both of these have been very helpful in the development of this tool - thanks a lot!

Libraries:

• libusb
• FLTK

Project status

Completed:

• USB descriptor details obtained with lsusb (see /doc/lsusb_vvv_audient_evo_8.txt).
• USB control messages sniffed with Wireshark and included in the file /doc/usb_control_messages.ods (also includes messages no implemented in the program).
• Basic GUI implemented as a transfer matrix allowing the user to set the volume from any source to any destination.
• USB control implemented and working.

Limitations/still missing:

• It is only possible to use this program before Jack is started, as the detaching and reattaching of kernel driver messes up Jack. Please let me know if you know a way around this!
• No parameters are read back from the device, so the settings are reset at startup.