The second one is misbehaving. Have a look at the photos. The first one the the output of Bank 0 / Wave 0 fed by a triangle wave. You can see it's outputting a decent sine wave as it's supposed to. The second one is the output from the problem one, same input etc. You can see there's some distortion/interference and you can also hear this in the output. It's not a trimming/calibration issue. I've compared every component between the two modules and they're identical (the older one is a first revision, the second one is a newer revision). I've reflowed all the joints and checked it over for shorts. Nothing so far.

