I’ve made some videos showing the noise. 

First vid is just my guitar straight into my amp with the Volume rolled off.

Second video is my guitar through the H9 – guitar’s volume still rolled off – and into the amp. The H9 is bypassed but adds some noise.

Third video starts with the same setup as the last but with the Effect On then Bypassed then On again. I got this new from Sweetwater.

I tried different cables and different power outlets. I’m using the supplied H9 PS. I had it plugged into my Voodoo Labs PP2+ accessory power input and then tried straight into a wall plug for these videos. The H9 performed the same in both power options.

Video 1: https://www.youtube.com/watch?v=5ydQqApLAiQ

Video 2: https://www.youtube.com/watch?v=2j8dwzlqVyo

Video 3: – the rhymic noise is the delay trails.   https://www.youtube.com/watch?v=todayBW4ewg