I'm considering using the Rehearscore App and/or Plus but have a couple questions.

Is it possible in the App to adjust the volume of the individual tracks?  I.E. Can a single vocal track be made to be heard better by lowering the volume of the remaining tracks? 

Also, is it possible to assign a different 'voice' to an individual track?  For example, I wish to bring out than individual vocal line by having it use a Clarinet or other instrument while everything else remains Piano?   

Thanks!  EdK