always enclose statements in curly braces
update comment formatting
2 lines between functions, curly brace on same line as function name
move update function to end of file

"But this is pointless!" --- Yes. But I'm trying to align this project
with my port of the mda piano plugin. Eventually, the two could be
collapsed into one project.
cosmetic changes
change formatting to match mdaPianoVoice.h
cosmetic changes
undo indentation for public modifier
only use types in declarations
replace note with m_key
define SAMPLES_PER_NOTE
remove unused tune parameter