Hi folks. I'm using the 4 Cable Method with a Fender Deville amp. The issue happens when I use my JTV 69 and when I connect a traditional guitar. The issue is: when I have the FX Loop 1 switch on (sending the signal to my Deville preamp), the volume out of the Deville is about 80% reduced compared to the normal volume. I'm testing with a preset that has no effects, 0dB output level, FX Loop 1 parameters Send and Return = 0 dB, mix 100%. Please see my setup and test results.
1) setup. I have tested and retested with reliable cables.
Guitar -> Helix guitar/Variax In
Helix Send 1 -> Amp Instrument In
Amp Send (Pre-amp out) -> Helix Return 1
Helix ΒΌ inch Out -> Amp Return (Power amp In)
2) In global settings, I have 1/4 inch out, Send 1, and Return 1 set to Line Level.
3) I have tried Send/Return 2 but did not work either
4) If I disconnect the Preamp out and Power amp in cables (signal chain is Guitar -> Variax in -> Send 1 -> Amp instrument In), I get the correct (loud) response from the amp). The issue seems to be between my preamp out and the power amp In. However, with FX Loop 1 OFF, all my presets work great (Helix signal out through the power amp.
Any ideas? Thanks!