EDIT: Updated, see Below.
not sure if somebody posted a similar howto somewhere... at least i didnt find anything...
i was looking to have 4 outputs at the same time which was kind of tricky since the fast track pro natively delivers only two stereo outputs (A and B) to choose from.
with a little alsa hack it worked for me :)
put this to .asoundrc in your local folder
be aware that your hardware address might be different (according to the ouptput of "cat /proc/asound/cards")
the lines marked with ### eventually need to be edited!
slaves.a.pcm "hw:1,0"; ###
slaves.b.pcm "hw:1,1"; ###
card 1; ###
card 1; ###
now start jack with:
jackd -R -d alsa -d multi4 -r 44100 -n 3 -p 1024
and voila... you should now have 4 in and 4 out to choose in qjackctl or ardour :)
and they are even synced (as far as i could find out both stereo outputs use the same "clock")
hope it will help somebody :)
btw: my distro is archlinux with kernel 3.2.11
I have been having a lot of issues with the digital ins and xruns, I will try this next week when I return home from visiting my hometown and see how it goes.
Here a post:
I have successfully enabled 4 ins with what Paul explains there, but that persistent xrun I have no been able to track it down from where it comes. If I only use the 2 analog ins everything works great.
Thanks for this tip.
cool... im curious about your feedback...
I found another way to do this today. I got it from the first page of this writeup: http://www.noid.net/hydraplayer/docs/08_README.cloning
Here is a summary:
1) In qjackctl, open the Patchbay
2) Create an Input Socket for your default output (playback_1 and playback_2, in my case)
3) Create another Input Socket for the second set of outputs you want to use (playback_3 and playback_4, in my case)
3b) Create a Forward from Input Socket 1 to Input Socket 2
4) Save the Patchbay configuration
5) Activate the Patchbay configuration
I haven't tried it yet for soundcard inputs, but I imagine it would work the same way (just use Output Sockets instead of Input Sockets).
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