This is not possible if one is to maintain a consistent BPM between a 3/4 audio and the step sequencer, since Geist interprets a 12 step loop as 3 measures of 4/4 time (and ALL audio loops in the same way, by merely assuming the length of the loop is a multiple of 4 steps), not 4 measures of 3/4 time.
In order to synchronize correctly, Geist would have to include time stretching.
Personally, if Geist wants to make a step sequencer, then it should include in its advertisements in BOLD RED LETTERS
that Geist only does audio in duple meter, since I assumed that it could be used as a VST in a 3/4 DAW project. Ableton Live 9 does it right as far as the time stretching is concerned.
I rejected GURU for this lack of capability (most of my work is in 6/8, 3/4), but forgot about it since Geist looked so good.
One would assume that a company like FXpansion would produce state of the art in a rhythm device that incorporates audio...
But I'm all heart, and will help them out for free so they can get up to the level of Ableton Live 2.0....
I play in a prog-metal band. I know what a time signature is!
You don't have to even have even measures in Geist - think of 1 step as a 16th note... use as many steps as you need to complete a beat, or a bar, or a partial-bar. It *is* a step sequencer, not a piano roll. So some amount of figuring out how it should be programmed/sync'd up to the rest of your music is inevitable.