how to change instruments much faster in the mixer??

Goodmorning!
I mostly create rehearsal and home-practise files for students. This means in a 4 voices mixed choir that I basically make 4 versions. If it is the soprano version then I put that one in another - more distinctive - instrument and keep the rest in the background so that the student can still here the complete score sound. If it's the alto's turn I first have to switch back the changes in the soprano part and make the changes in the alto part. And so on.So its a temporarily change. I do that in the mixer but that means every time endless scrolling back and forth between piano and voice ahhh section. (for example) for I cannot just type an instrument. Besides the list in the mixer is not alphabetically. For good reasons I am sure but it is still a lot of work to only find the necessary change by scrolling the list. It takes time and is annoying. Any suggestions to make it easier and faster? Thank you!