With a connector board it should be possible to move from the current teensy++ platform to a teensy3 platform. This would give much more free memory (bigger sequencer) and would open the opportunity to optionally replace the 2 digit led with a mini lcd (those 1.4") to provide better visual feedback.
The code should be portable, some 3.3 v <> 5v hardware levelling would be required .
It's probably doable, but at this point, it might be better to use a fully custom PCB as the level shifters would require a separate PCB design anyway.
With a connector board it should be possible to move from the current teensy++ platform to a teensy3 platform. This would give much more free memory (bigger sequencer) and would open the opportunity to optionally replace the 2 digit led with a mini lcd (those 1.4") to provide better visual feedback. The code should be portable, some 3.3 v <> 5v hardware levelling would be required .