I am synchronizing a hardware sequencer (Urzwerg) as slave, via MIDI cable, with Looptastic HD as master on an iPad 2, and works well.
I am also sampling loops with a Peavey AmpKit LiNK and also works well.
The problem is that,
when MIDI sync is active, if I try to sample at the same time, I get only a noise like an old modem, which seems to be the MIDI streaming.
The sound (not exactly modem like noise, but clearly the MIDI streaming) occurs whenever you have plugged the cable to the MIDI OUT of the sequencer.