ADSR Fix

There were some errors in the ADSR implementation. Some of the default character of the sequencer shifts with this change, but it's ultimately an improvement.

Docs and Sequence Selection Fix

There was a minor but irritating bug in the behavior of selecting a sequence via encoder from default. It's fixed.

Grid fixes

Addresses input issues with midigrid and enables boot without grid along with adding one later.

Initial Release

It does all the things it's meant to, but it's only been tested on a handful of devices.