Add leak-dc to the sample output.  Fixes a few "TOO LOUD!!" issues.
Update to add :cello tests.
Move cello from bank/inst/raw -> bank/inst code split.  Next to add synth & delete raw.
remove cello raw file
Add cello synth + tests.
Add piano synth. Switch to using bank/inst/synth division of files.  remove raw piano file.
Minor tweaks to cello & test.
checkpoint some analysis mods.
Update to note synth/inst variants.  Add note about explicit note-off control.