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Just got the Helix rack and control board one week ago, so far the unit is marvelous in terms of usability, flexibility, and sound preservation. Yes, a cannot emphasize this enough how important the preservation of an original sound for me is. I use 2 amps, Mesa Boogie MKV and a Marshall Jubilee 2555, both wired with the 4 Cable Method. So far the Helix maintains the sonic integrity of the MKV and Marshall. When using just one amp, hum is no issue ether with either MKV or Marshall 2555. A. When cabling the preamps into effects Loop 1 MKV and effects Loop2 for the M 2555, I can alternate between both preamps. In this case the hum involved (ground loop - DC coupling) makes the whole setup unusable. B. When cabling the preamps into effects Loop 1/2 (Setup as Stereo) for MKV and the M 2555, I can alternate between both preamps using a Lehle SGoes Amps switcher (the red one) which uses a High Z transformer for avoiding DC coupling. In this case the hum involved (DC coupling -ground loop) is reduced significantly Here is the Routing: I use the send from Helix effects loop 1 wired into the Lehle Input. The 2 Lehle Outputs are wired to MKV Input, and Marshall Input, the MKV effects send is wired to Helix effects loop 1 return, the Marshall 2555 effects send is wired to Helix effects loop 2 return In both A and B, the Helix Outputs are wired to the effect Returns of MKV and 2555 The sound preservation is amazing, but the hum remaining still needs to be addressed. Any ideas how to get even lower hum levels with this setup? Thanks for any helpful advise Regards