I think the G force was designed as an effects loop device and to be run at line level. Shouldn't be a problem going down in signal strength from line level to guitar level, as the signal is getting weaker. I think my problem will be going the other way around. The G system does enable you to cut up to -8db off the incoming signal from the guitar, but I'm not sure about impedance mismatches from the line out of the Mojave. I might have to ask on the Mojave amp forum, or send an email to Vic. I know he is super busy, but there is not user manual for these amps. I know that sounds silly since they are about as straight forward as an amp can get....except for the line out!!