Hello, all!
In the last couple of weeks, I’ve been experiencing some very odd noise from my modular: a periodic DC offset pulse that sounds like a blip at about 2.6 Hz. I notice this noise when outputting through my Expert Sleepers ES-8, my Doepfer A-138p, or directly from a sound source to my sound card. It doesn’t seem to track the behavior of any other module in my system (that is, it isn’t synced to clocks or other LEDs) and it doesn’t seem to be associated with anything else nearby – I’ve unplugged lamps and turned off my computer, to no avail.
For an example of this phenomenon, here’s what should be a plain sine wave: https://www.dropbox.com/s/o6fypv0pte76ucj/sine-blips.aif?dl=0
Are there some good strategies to debug this kind of problem?