Korg Tuner in Effects Loop to eliminate hum?

[NorthShaun]

Quick query... I'm getting terrible ground loop hum from my DTR1000, which is first in my rack signal chain (I play at high volume).  I currently have 1, 6, 11, etc patches set to mute, so I can silence my rig between songs.  My query is, if I install  my Korg, effects loop send, on these mute channels, will it receive a signal? ie, with MV, OD1 & OD2 set to zero, does the effect send circumvent these settings?  I currently have the Korg plugged into the earphone out, but obviously when the rig is muted, so it the tuner, which makes silent tuning a non option!

[MarshallJMP]

Korg tuners are know for this problem,but wat you want to do won't work if you set the MV to 0 since the loop is after the volume control.Do you have other fx units after the mp-1.Maybe you can mute the signal there?