Is there a way to loop playback only the treble clef or only the bass clef?

I have a piano score and I want to listen only to the treble clef or only to the bass key. I've already asked this question and was advised to put the Piano as Solo in the Mixer. However, it doesn't seem to work. When I press the M button in the piano column, I can't hear anything. And when I press the S button, I can hear both the treble and bass keys. Is there a way to achieve what I'm looking for?