looking for any help on the muting of instruments in biab.

Seen it before but cannot seem to find it again..

Like p for piano g for guitar etc. How do you input it ?.


win 10 64 bit 16gb,i7 chip, ssd 500gb, m-audio air, ,Roland BK-7M, 1000,shure sm7b,sonar,acid,mixcraft, variety of plugins.Sample tank 3,Kontakt. TC Helicon Voicelive 3 2 .
https://beatmaster1.bandcamp.com/releases