ano tento progam tam mam a piše mi při spuštení:
The JACK sound server needs to be running in order to run IDJC.
In order to manually start it try something like:

$ jackd -d alsa -r 44100 -p 2048

If you would like JACK to start automatically with your user specified parameters try something like this, which will create a file called .jackdrc in your home directory:

$ echo "/usr/bin/jackd -d alsa -r 44100" > ~/.jackdrc

If you have already done this it is possible another application or non-JACK sound server is using the sound card.

Possible remedies would be to close the other audio app or configure the sound server to go into suspend mode after a brief amount of idle time.

If you are trying to connect to a named jack server, either set the environment variable JACK_DEFAULT_SERVER to that name or launch IDJC with the -j jackservername option. For example:

$ jackd -n xyzzy -d alsa -r 44100 -p 2048 &
$ idjc -p profilename -j xyzzy