So I have a Mackie ProFX16v3 and when I try to record from that into my computer via USB only the first input on the board actually sends to my PC. I tried moving that cable to other channels and nothing. I even adjusted my input on reaper to the corresponding channels and nothing.

How can I get it to record or even input from the other channels?


The USB output from the mixer is pre-main fader so should deliver 2x4 24bit 192kHz stereo signal to the computer, according to the User Manual.

Also, read the manual and check all of the following:

  • Line/Hi-Z switch
  • Set all knobs at midpoint
  • FX switches
  • Mute switches
  • Solo switches
  • Channel assignment switches

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