Problem connecting modeler to amp

[hebing_rain]

Recently I bought a 1994 Digitech GSP 2101 preamp/effects processor. I intend to use it with a tube amp and use the processor just for the delay/reverb/harmonizer WHILE using the preamp/distortion of the amp head. I connected them using the 4cable method and encountered a problem. Along with the amp's distortion and the processor's delay I am also hearing a clean DI signal that's noticably overpowering the amp's distortion. All suggestions to a solution are welcome.

 

[Demiurge]

Could it be that there's a wet/dry mix on the FX unit such that its output includes the clean signal?

 

[sonoftheoldnorth]

Are you sure have it cabled correctly? Also, why 4 cable if you're just using it for stuff in the loop... just put it in the loop.

 

[CanserDYI]

Agreed with above, over complicated routing for just FX.

 

[Demiurge]

Maybe 4cm allows for the harmony to be put before the preamp? My guess.

 

[hebing_rain]

Are you sure have it cabled correctly? Also, why 4 cable if you're just using it for stuff in the loop... just put it in the loop.

I'm not sure. Can you suggest a cabling method?

 

[Turd Ferguson]

Potentially dumb question: were processors from that era even capable of true 4 cable connection? I don't recall that being a thing in the 90s.

 

[sonoftheoldnorth]

I'm not sure. Can you suggest a cabling method?

If the unit is capable to 4cm, I think it should look something like this:
Guitar>Digitech input
Digitech FX send>amp input
Amp FX send>Digitech FX return
Digitech output>amp FX return

 

[Turd Ferguson]

The GSP manual is online. It does not mention or show 4cm as a connection option. I think with these older units all you can do is run it in the amp FX loop:

Amp FX send -> GSP input
GSP output -> Amp FX return

AFAIK, the only Digitech unit that operates in 4CM by design is the GSP1101.