Did the test and yes when turning on the fx loop block before the Teemah! It makes loads of noise . Very hissy and very unusable , especially as I mic my amp, that would sound like a passenger plane through our P.A !!
Im returning it which is a shame because everything (price,footprint,ease of use,quility delays)was great but this white noise is ridiculous.
Turned my normal setup on through the loop (Boss DD-500,El Capistan ,Flint) and it’s silent.
Going to try Source Audio Hub and pedals instead.
a side problem to was the hum I got if I plugged the HX Effects power adapter into the 4 gang extension I was using. Made everything sound like ****
Also the USB cable in the box was a dud