I learned a really simple and useful fix today for a problem that was nagging me – and sorry in advance to many of you to whom I'm sure this is old news. It relates to “digital whine”, or a high-pitched whirring noise, leaking into a pedal chain. I had attributed this to – and assumed it was inherent to – a less-than-stellar digital effects pedal I use most of the time. While still true in some respects, the effect is not inherently in the signal path at all, but rather digital switching noise bleeding back through the power line into other pedals through a shared, branched 9V power cable, wall wart, and getting into the signal chain that way. This has been commented on in by Jody Page of PedalSnake on the web, https://www.pedalsnake.com/blog/2016/09/dealing-digital-whine/ and is readily cured by getting the offending pedal off the shared power line. So the offending digital pedal should have filtered its power line to preclude this, but this one didn’t and I incorrectly assumed it was inherently noisy – but no, now my setup is as quiet as a mouse. So, color me stupid - I’m sure many know this already, but it was useful to me, and maybe others will benefit from this simple fix as well.