Just a couple of weeks ago Loopseque was updated with MIDI, and today they've added Audiobus support!
What's new in 2.6:
- Audiobus support.
- Minor bugs fixed.
Unfortunately there is a known bug in Loopseque's Audiobus URL scheme. This is the way Audiobus launches other apps, so you'll have to launch Loopseque manually.
A fix has been submitted to Apple. In the mean time you can use Loopseque with Audiobus, just make sure you launch Loopseque before trying to connect to it!