Pro Audio Support

Q:
When I select the B4 in the usual instrument channel it appears, but creates a terrible distorted droning sound. Visually the plug in is fine, and responds to midi input; sonically there is no reponse to midi. If I select a different audio instrument, or arrange track, the noise disappears, but as soon as I re-select it, it comes back. As it stands, the instrument is unusable - I'd like your advice as to how to solve this problem.
 
A:
This is a known bug since the Logic version 6.3.1 There are two workarounds:
• Use B4 as a multichannel instance or
• Please choose a sidechain input from the above instance of B4 (it doesn't matter which one) and then you will have normal functionality of B4.

Native Instruments is working on a patch to correct this issue.