From the Alesis web site
I would like to route audio from the computer to the MultiMix, apply the MultiMix’s EQ and digital effects, and then record this audio back to the computer. Is that possible?
This is possible, but it requires some additional cabling.
1. Turn the HEADPHONE/CONTROL ROOM volume knob all the way
down.
2. Press the 2 TRACK TO CONTROL ROOM button down, and leave
the 2 TRACK TO MIX button up.
3. Take a pair of cables, and connect the CONTROL ROOM OUT jacks
into a line-level stereo channel’s input jacks.
4. Connect your speakers to the MAIN MIX OUT jacks.
5. Slowly increase the volume on the HEADPHONE/CONTROL ROOM
knob until a good signal level is reached on the line-level stereo
channel chosen in step 3.
6. EQ the stereo channel to taste, and dial in the right amount and type of
digital effect.
7. In the computer, record the MAIN mix.
Note that you can only route two channels from the computer back into the
MultiMix this way. No more than two channels from the computer are ever
available to the MultiMix