Need to change sound for a mixer channel in mid-score

I use MuseScore a lot to practice singing a part for the choir I am jn. I input the sheet music (which also gives me lots of practice reading and understanding the music), usually using a SATB Closed + Piano template, and set the sound for the tenor ii or baritone parts to Mellow Grand Piano while all other parts are Choir Aahs Expr.

With my current song I am signing both tenor ii (mms 1-40) and then baritone for the rest of the piece. I would like to be able to switch the tenor ii and baritone sound at will between Choir Aahs Expr. and Mellow Grand Piano.

Is this possible?

Thanks