Fix event count display in event list button.
pad lower octaves with gray keys
Merge pull request #152 from kagu/fix_event_counter

Fix event count display in event list button
Handle KeyboardInterrupt in the tracker main loop.
Merge pull request #154 from kagu/fix_keyboard_interrupt

Handle KeyboardInterrupt in the tracker main loop
remove hard coded key limit
Merge pull request #153 from cyberixae/fix_low_octave

pad lower octaves with gray keys