I've tried that. It takes me through the process, and I copy and paste the serial code, and it tells me that Amplitude 'Custom Shop' is now authorised. Problem is that the program in BiaB is Amplitude 3 and the program on IK Mulitmedias page is 'Custom Shop' - can find no download for Amplitude 3 there at all. The problem is still here, where there is am intermittent hiss sound when trying to use anything that has Amplitude in the title.