MS-2: Why do all my patch sounds stop on starting the Ultrabeat sequencer pattern?

Hi there,

This is my first contribution to this community, so let me first of all say 'hello' to you.

I'm really new to working with MainStage (MS 2) and I need your help:

My drummer does not like the original metronome sound, so I am using the sequencer of Ultrabeat for bulding a suitable sounding click pattern for him. As I figured by now this pattern syncs with the tempo of each patch or song and starts and stops the same way I would have the original metronome start or stop (space bar e.g.). Now the problem is that when I am playing my USB keyboard within a patch my drummer is perfectly able to tap the tempo for the upcoming song or track but when he hits play to let the click/click sequencer start he is interrupting my live sound in an unpleasantly abrupt fashion.

Has this kind of problem or its possible solution occured to any other user or am I simply using MainStage 2 in a completely false way trying what I am trying to do?

Thanks for your help, best regards,

Max