Why do Maschine MK3 transport controls also trigger VST sounds?


From this screenshot, we can see, Machine really sends all the MIDI Messages over the Virtual MIDI Port.

What you could do is to add the Input Transformer to filter the Transport MIDI Notes out. In this case, it would be something like

Filter Target
( Type is | Equal | Note | And
Pitch | Inside Range | A5 | A#5 )

Action Target