Okay, so I've been trying hard to get this to work, because BM2 is my iDAW of choice and I love the sound of iMini. It's by far the best-sounding iOS synth, in my opinion.
I'm using an iPad 4 and iOS 6.1.3.
With BM2 and iMini open and freEWI running in the background (as suggested above) I found I could use BM2 to sequence iMini, but whenever I touched a knob in iMini the knob started flying around seemingly at random.
I then installed MidiBridge. Connecting BM2 and iMini in MidiBridge cured the knobs-flying-around problem. However, it was still necessary to have freEWI running in the background, for some reason.
I then found I could use Audiobus to record audio from iMini into BM2. However, the timing of the recorded notes was not good - none of them were exactly on the beat, and some of them exhibited more latency than others.
I tried the above again this morning, and for some reason now I cannot route audio from iMini into BM2. As soon as I connect the two apps in Audiobus, iMini goes silent.
This is my first attempt at interconnecting apps 'live' (rather than using ACP) and I am reminded of the bad old days of trying to get different bits of hardware to work together!
Please, has anyone got any further with this?