- Fixes song default song speed
- Adds a sequencer to the tools (@KilledByAPixel)
- Fixes popping if first notes are empty due to undefined values (@KilledByAPixel)
- Allow negative values to stop notes (currently only used for -1) (@KilledByAPixel)
- Fixes pop at end of song where final note is cut off to allow for better looping (@KilledByAPixel)