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Marcus Müller marcus.mueller at ettus.comHi Martin, never feel ashamed for asking questions. I've learned (support stuff) that the more at ease you are at potentially missing something, the easier others feel at answering questions, and the more pleasant the process is for both sides. And yeah, I've got no doubts you /could/ have spotted this – but not spotting this in a couple hundred lines of code is really not a fauxpass nor a sign of anything negative. Instead, investigating what makes a piece of technology tick or misbehave (in this very case, more the latter) and writing an extensive email explaining your question and giving a bit of background – what more could FOSS projects ask for?! > I tend to try ridiculously simple ideas first > in hopes that one will work. In FM reception, the loudest noise > occurs when there is no signal or on occasion if there is a > nearby signal just outside the passband in which case the noise > squelch is closed more tightly. Yep! Classical noise-squelch! Direct baseband mixing receiver problem: You might have a stable pseudo-carrier through LO leakage. Direct baseband mixer solution: DC block the heck out of your baseband :) I'll let the others answer your further audio-signal questions; I must admit that I'm on a train, which isn't necessarily the easiest environment to diligently write emails :) Best regards, Marcus