Scooter,
Are you referring to the same noise that others in this thread have had…the high pitched whine, in which the frequency is affected by the rate knob and completely disappears when the depth knob is fully counter-clockwise?
I’m pretty sure this noise as a function of where the pedal is in the chain doesn’t have anything to do with an impedance matching issue. At least i can’t imagine how it could. This version of the pedal (8.2) has a very high input impedance and a low output impedance, so theoretically it should fit into an effects chain very nicely. I think it may have more to do with the power configuration of the pedal board. You could experiment with different pedal power wiring (like putting it at the beginning of the power chain), but it’s best to put the Quaverato on it’s own power circuit because it draws a decent amount of power (over 50mA). It’s usually fine to share power with pedals that draw very little current, but you can run into noise issues when you share power between higher current drawing pedals.
If you can’t find a decent power configuration that helps then the next step is to try putting a 1uF cap across pins 7 and 8 as described in post #25415 above. This seems to have cleared up this issue for at least a few people.
I hope this helps. Good luck.
-Brach