yea I own the same tuner pedal DT10-BK,, the black one,,I love the thing.
I use it in the loop of my ROV right before my EQ pedal which would amplify any noise it may create. Silence is all I get. I couldnt recommend this tuner pedal enough. By the way I believe its true bypass also,,
if it isnt it does a superb job. I have tried it with both outputs,,the bypass and regular output and no sound difference in either. I hate to say it, but
if your getting any noise somethings wrong with the pedal or its coming from somewhere else....P.S. Im also using it with my visual sound
1 spot power adapter along with another 7 pedals. Quiet is all I get
Good luck