Tangible Instruments has launched a Kickstarter campaign for Arpeggio, a portable MIDI arp/sequencer with a built-in synth. It reminds me a lot of the Yamaha QY series of portable sequencers. This little device sets itself apart from Yamaha with an impressive array of I/O ports to get the MIDI out of it.
Arpeggio includes CV, USB, MIDI Din, and even Bluetooth support. I spoke with co-founder Charlie Lesoine about Arpeggio's compatibility with iOS. Since it includes both USB and Bluetooth, I was hopeful that both would be supported:
"MIDI over Bluetooth will be supported for iOS and likely USB too."
The Bluetooth support alone is pretty awesome. Here's hoping for USB as well.
If you're in the market for a portable sequencer/arp this is relatively affordable at $180 for early birds. The price keeps going up as the early bird specials get picked up, with a final retail price of $200. They hope to ship in April next year.