I have the following setup: Fender Deluxe Strat (USA) Martin D28 acoustic with Fishman Acoustic Matrix Natural II under-saddle pickup Fender Deluxe Reverb combo amp Morley ABC switcher SP compressor pedal Fullton Fulldrive 3 Overdrive pedal L R Baggs Para DI Acoustic preamp Line6 Relay G30 wireless system Using the Relay G30 feeding into the Morley switcher, I can route the Strat into either of the Deluxe Reverbâ€™s channels â€“ with or without the FX units - with no problems. However, when I change to the Martin, using the switcher to route it through the Baggs unit to the ampâ€™s Vibrato channel, significant high-frequency interference occurs, which fluctuates as I move the guitar and wireless transmitter around. Using a cable from the Martin to the Baggs unit (i.e. no wireless), this does not occur. Either the Fishman or the Baggs unit is disagreeing with the wireless transmitter. All advice/suggestions gratefully received.