A big second on the slicer, however this will only be effective when the H9 is able to receive PLAY, CONTINUE, and STOP MIDI commands. But I know you guys are working on that. This will turn the Harpeggiator and Tremolo into real weapons.
Also, A BIT CRUSHER!! I know VintageDelay can do a very limited bit crush, but I'm talking something full featured like a WMD Geiger Counter or a Hexe Bitcrusher. Not only would this be cool for guitar (my focus) but would be great on keys, drum machine, etc.
If the MIDI command issue is fixed and a slicer and bitcrusher added, I will DEFINITELY buy another H9. That's the cool thing with the H9, the software expandability makes it possible for the H9 to eventually replace a lot of other pedals on our boards. I'd rather have 3 H9's on my board than a few other type of pedals. Can you imagine the versatility???