This is no issue, it's just a fact - my Drums go out via the four monitor outs (Bd, Kick etc .. separately)
And also they _would_ go out on the Main-Out if the "Main-Fader" (driven by the big knob) would be up.
To hear my M20d-recordings on the PA I need the Main-Out (with Volume up)
In case I record the drums I don't need Output !
(remember: I use the M20d as my Submixer, it's not the main mixer)
.. Well, I didn't try out what happens if I use the Mute Button(s) - does this also destroy the Main-Out-Recording ?