- 4 channels
- insert & delete notes
- changed pattern length to 64
- load & save
- block selection
- cut, copy, paste, select all, block erase
- alt-f4 closes program
- fixed glitch with pulse width speed
- page up/down moves in song
- shift-space plays song from beginning, space loops current pattern
- insert/delete to song editor
- envelopes updated at 50hz
- channel effects
- updated readme