"About DMX’s Multi-Out
New in version 1.1. Oberheim DMX now offers stereo multichannel outputs for each of the 8 channels and 2 FX channels. The outputs act like mixer-style pre-fader sends and are not affected by the channel’s volume, mute or solo settings, and do not pass through the master bus section in DMX.
Setting up an individual output in your DAW does not automatically prevent it from also coming out of the main stereo out. This allows for parallel processing, but means you’ll need to mute the channel in DMX if you only want to use the individual out."
https://www.gforcesoftware.com/products/dmx/