For the booth out... it’s not sounding the best because the adapter you are using is grounding or shorting out one of the outputs. It does work, just not the greatest. What you need here is a 1/4 inch TRS to rca. ( just remember balanced TRS connectors are like an XLR, just a different format. +, -, and shield )
See Rane note 110 for reference
https://www.rane.com/note110.html
Similar deal with the M audio adapter, but in reverse.
Can the M audio output on those RCAs while recording on the TRS ? If so it would be cool to use the TRS booth out into the TRS in on the M audio, and use the RCAs out to your other amp. The manual does say that it can be used for monitoring.
The only down side is that you would probably have to leave your booth level control alone. You could put an inline preamp, on the RCA monitor out of the M audio though... use that as a volume control.
There’s a few options i think....
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