Rayhall: Have you discussed with Emmanuel the impedance match between the FS and the Pass Aleph 4? I know the FS output impedance is higher than normal and the Aleph input impedance is lower than normal. I don't know if an impedance mismatch would cause the artifacts you describe, but it might be worth investigating.
What can you tell me about First Sound pre-amps?
Only recently have heard about these pre-amps. Are they as good as they are made out to be? Is the least expensive model as good as say a R0land Synergy? I live in Seattle and have never heard of this pre-amp so any information would be GREATLY appreciated. Thanks in advance, Jerry.