drum staff change print line of instrument

[Patrick Stanistreet]

I completed a cheat sheet for the drum staff
and noticed that middle b is used for most
instruments.  I would like to alter the
line an instrument prints on say to distinguish
mute hi conga from low conga.


Another drum staff question:

lilypond version 2.3.10

I tried combining two drum instruments on one staff, they
are on different staff lines.   Stacked rests are causing
collision errors during score generation

I have thought about how to resolve this; for instance
the notename\rest technique but it doesnt seem to apply.