Hi,
With a relay switching, high pitched modulation signal almost disappeared. But very low level ticking noise are still there. I can't remove it for now. As blend control turning up, ticking noise get louder. With blend turning full CCW there's no noise. The ticking is in wet signal.
I mainly use this delay with clean channel so the ticking noise doesn't sound as audible level. But in distortion channel, you can hear it clearly.
I'm satisfied with the delay sound itself!
I made DMM and my clone comparison movie. My DMM is EC2002 4 x MN3008 version.
After 5:20 there's ticking noise with distortion channel.
https://www.youtube.com/watch?v=wdsVValslQY&feature=youtu.be