Novice question here; will the Effects works with an external preamp hook up in the loop return? I'd like to use the Power (Bogner) section with a tube (randall rm4) preamps..
If not? is there a way to bypass the digital amp modeling? connecting into guitar input to utilize the effects?
Please specify which SV you have. I will only comment on the SV MkII (Bogner) here.
1st and 2nd question: No, the effects will be bypassed. [Edit from SV MkII Pilot guide, #14: Power Amp In – ...You can then use the POWER
AMP IN either as an input from another preamp or multi-effects unit like the POD X3 Live or as a “series effects return”.]
3rd question: Anything connected to the guitar input will utilize the tube preamp and effects. It's ok to connect guitar style pedal effects to this jack (like distortion, wah, etc..)