Hello Andrew,
hello Mac,

thanks for your concern!
Well - I'm using Windows7 now and BIAB build 313. (But the problem occured already with WinXP and previous builds of BIAB).
I'm using the ASIO-Driver of my Edirol PCR controller keyboard.
And - Mac, you may be right that the problem may be here - I'm using the Native Instruments BANDSTAND synthesizer.
It would be so nice if you could give me some hint how to find a solution with this configuration. (I like the sound of the BANDSTAND synthesizer so much. I would rather abstain from the conductor feature than from BANDSTAND (with ASIO).)

Thanks again and
Greetings from germany

Ulrich