Have you tried unplugging your Clavinova CVP 307?
Or setting its CC2, CC7, CC11 (all volume controls) to zero?
My thought is maybe your Clavinova CVP 307 is seeing the MIDI data and playing it. I say this as when you delete the MIDI data nothing plays.

I have used RTs along with a lot of MIDI sound sources, software and hardware, and never had this problem.

I am glad that you found a workaround.


OK, a random thought;
Why does toilet paper need a commercial? Who's not buying it?

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware