Installing custom modes on GNU/Linux

On GNU/Linux systems using ALSA, compiled custom modes (.syx) can be sent to your Novation MIDI device as follows:

Check if amidi is installed by running amidi --version in a terminal. If you see command not found, install alsa-utils (likely available in your distribution).
Ensure the device is connected to your computer, and that no software is using the device. If JACK is running and using ALSA MIDI, it must be stopped.
Make sure the device is in custom mode. If the device supports multiple custom modes, select the mode that you want to overwrite.
In a terminal, run amidi --list-devices. Find the line that corresponds to your device. It should look something like:
```
IO  hw:3,0,0  Launchkey Mini MK3
```
If there are multiple lines for your device, use the first, but try others if that doesn’t work.
Run ncc-alsa-send <port> <file>, where <port> is the second column in the line of amidi output above (hw:3,0,0), and <file> is the compiled .syx file. For example:
```
ncc-alsa-send hw:3,0,0 my-custom-mode.syx
```
(ncc-alsa-send is installed in the same location as ncc. If that location is in your PATH, ncc-alsa-send should be available.)

This is essentially a wrapper around the following commands, which, if desired, can be run manually instead:
```
amidi --port <port> --send <file>
amidi --port <port> --dump --timeout=1
```
The second command ensures that the response from the device is read after the custom mode is transferred; otherwise, the change may not take effect.

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