Don't know if this is the right section for this, but I'm having a noise problem recording with the QTC40 and Grace preamp. Thought maybe I could skip testing some parts of the recording chain if I describe the problem in enough detail. Using 5 mics with this project, when the Grace input began to make some noise, then the signal disappeared altogether. Simple enough, eh? However, I kept recording and the signal re-appeared with no changes on my part. I stopped, checked all connections (high quality mic cable into Grace, high quality cable from Grace into RME Multiface II). No noise from any other mic inputs. The only step I took was to swap out the output cable. Looks like my problem could be: 1. Bad mic 2. Bad mic cable 3. Bad preamp 4. Bad input into the RME Of course the problem is intermittent and I had a tough time recreating it. After it first appeared, all seemed normal after a minute or two, then it reappeared, then it disappeared, then....etc. This doesn't sound like cables to me, or does it? Any input appreciated.