I’m only using the main track to provide bindings to trigger from my keyboard, to record onto Studio One tracks. Nothing is played in Scaler. By arming both the Scaler and Piano tracks I record onto them at the same time using the keyboard. Having got those tracks recorded, I use keys lock to improvise a third track. Keys Lock Chord Mute is on. It isn’t recording the chords onto the third track, it’s recording the chord placeholder notes from the scaler track, i.e, just one note as per the screenshot. This all works perfectly in Scaler 2.
I posted the workflow on this forum in answer to a previous post a couple of months ago: Biggest wish for Scaler 3 - #4 by NickC4555
It works in Scaler 2, but not in 3 because of the problem I described, which you can see in the screenshot.