Thanks - I must've missed that TPS episode. I'll do some cable swapping with just the SD-1 when I get a chance. On a battery. I swear the noise in the buffer is discernible to me. (to be fair, it's no waterfall, but it is disernible) I'd be relieved to find out it's the power supply. That's easy enough to replace. But I'm worried it's probably "crazy picky". I mean, I've never had any of this trouble with my acoustics.