Hi there,
I have just uploaded 10 profiles of my Avalon VT-737 SP Studio Preamp. Some of them have been done with my Mesa/Boogie Flux Drive in front of it.
Bass used : Harley Benton PJ- HTR Deluxe Series
Give it a try and tell me what you think !
(Don't forget to adjust "input sense" accordingly with your bass !)
Cheers !