Perseverance? THAT'S IT. I was experiencing playback sounds coming into my newly recorded tracks. The geeks spoke. I listened but here is the remedy because I see many has this problem.
(1) Patch LEFT and RIGHT LUNA DEST into SND1
(2) Patch LEFT and RIGHT ASIO DEST into SND2
(3) Patch LEFT and RIGHT WAVE DEST into SND3
and so on according to the drivers you have selected. Whatever driver you are using patch their LEFT and RIGHT channels into one SND1 or SND 2 as the case may be.
The SOURCE is dealt with as usual. LEFT and RIGHT channel to LEFT and RIGHT channel on mixer etc.