Lovely indeed! Yes, it's Bonobo - the track is "Recurring" and it's off the album "Days To Come".
https://itunes.apple.com/us/album/days-to-come/id416319613

@DuaneB Thanks so much! Please do, I'd be honored to have this project added to the list. I'll definitely update the code with the volatile fix, thanks for the heads-up. Actually I must thank you for the output circuit - I played with your Illutron B project just before I started this one, so I still had your output circuit on the breadboard when I started this one. I've kept it for the final design.

@Giò LFZ I'm only sending note values (fixed velocity) and duration via MIDI - no cc's, though that's a good idea for Groovesizer V2 ;^)

   

I've attached a 16-step sequencer to the original auduino.

There's a video, Fritzing breadboard schematic and download link to the arduino sketch at the link:
http://tinyurl.com/groovesizer

I hope you find it useful   

This sounds right up my alley - I've sent a PM (or two?)

Hey guys,

Just a big thank you to the-rebel-agent for the library. I'm totally new to the arduino and electronics, but managed to get my module up and running with very little problems. I sourced my module from the e-bay link provided earlier in this thread and changed the solder-jumper to  5v. Everything seems to be working as it should.