Chuck, Jack & Linux

DrumAliens · Joined: Jul 10, 2008 Posts: 31 Location: UK Audio files: 1

I have been happily using miniAudicle in Windows but I have recently been experimenting with Linux, puredyne, which comes with ChucK already installed.

I was wondering if there was a way of running ChucK so that each shred would come through as a different input to Jack. Doing it this way would allow me to record each shred on a different channel in say Ardour I can then mix things in a bit more of a controlled manner.

Any ideas.

Antimon · Posted: Mon Feb 01, 2010 8:26 am Post subject:

I think you need to set a different (pair of) channels for each shred. I don't think Jack can set up multiple devices. You do that like this:

DrumAliens · Joined: Jul 10, 2008 Posts: 31 Location: UK Audio files: 1

Thanks for the suggestion Antimon. Unfortunately I could only get the script to run with the first two lines adding in the other two lines generates an error

[chuck](VM): sporking incoming shred: 1 (test.ck)...
[chuck](VM): NullPointerException: (UGen link) in shred[id=1:test.ck], PC=[40]

Antimon · Posted: Mon Feb 01, 2010 11:50 pm Post subject:

OK, so you're running on the command line now, right? You will need to start ChucK so it can use more outputs. Here is what I use with my ChucK on OSX:

Kassen · Posted: Tue Feb 02, 2010 7:38 am Post subject:

Yes, it should be noted that the amount of outs and ins needs to be set at startup. If you really want to use a output per shred you could use something like;

Antimon · Posted: Tue Feb 02, 2010 8:52 am Post subject:

Also if Jack is giving you grief you can skip the shredding and record each track by itself into Aurdour - recording the first ChucK thing into the first track, then the next ChucK thing into the next track. Kind of like you'd do with a bunch of synths being played by MIDI into a single DAW Audio input.

A bit dull, but it might work if all else fails.

/Stefan

DrumAliens · Joined: Jul 10, 2008 Posts: 31 Location: UK Audio files: 1

Just done the --probe to see what options I/O I have

[chuck] # output channels = 2
[chuck] # input channels = 2
[chuck] # duplex channels = 2

So this is why I can't get anything beyond the 2 channels to run. So will have to resort to recording each shred separately ... or buying a decent sound card

Thanks all for help

Antimon · Posted: Wed Feb 03, 2010 12:00 am Post subject:

I haven't used Jack that much myself but shouldn't you be able to set an amount of inputs and outputs on Jack?

Googling around I foun this man page:

http://linux.die.net/man/1/jackd

where you can see for the Alsa driver that there are options called --outchannels and --inchannels.

/Stefan

DrumAliens · Joined: Jul 10, 2008 Posts: 31 Location: UK Audio files: 1

I have tried to increase the number of input and output channels in the Jack Control GUI. But it wouldn't let me apply without an error (assuming that I did it correctly). So I am guessing that have to have a physical device behind it which is capable of running the requested changes.

I will have another look

Antimon · Posted: Wed Feb 03, 2010 7:30 am Post subject:

OK.

Computers... can't live with them, can't live without em. Rolling Eyes

/Stefan