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Old 07-14-2019, 07:10 AM   #3
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Join Date: Mar 2008
Location: Planet Earth
Posts: 3,950

Up until a couple of weeks ago I used two M-Audio Delta 2496 cards in REAPER for Linux. To use only a single card I used this startup command in REAPER. The -Xseq is what made midi work.

/usr/bin/jackd -P80 -dalsa -dhw:M2496,0 -r44100 -p64 -n2 -Xseq

When I needed to use both cards at the same time though, I would use QjackCtrl for it's patchbay to route the inputs and outputs of the second card to REAPER. For that I used this script which setup midi and launched REAPER so that just starting QjackCtrl also initialized midi and started up REAPER. I had both "a2jmidid" and "zita-a2j" installed. You'll still need to drag-n-drop the connections for a second card in QjackCtrl, but it can be saved so you only have to do it once. Here's the script I used for QjackCtrl.

a2jmidid -e &
sleep .5
zita-a2j -d hw:3 &
sleep .5
~/.local/share/reaper_linux_x86_64/REAPER/reaper &
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