create really good default synths for drumkit nf-ss7c ← Beads

Twinned from https://github.com/cfsh/ninefold/issues/50 by tools/beads/import_github.py's reconcile pass.

do some research into some good kick / hat sounds that could be made with the synth controls we have available. if there are a couple more synth controls that would unlock better drum sounds then add those too as needed.