Just acquired a 115. I play only 50-60's R&B and Blues. Have all prerequisite basses P"s, J's, MMSR5, Yamaha5 all with flat rounds. An MMSterling4hh with rounds. Heads are GBShuttlemax, GBStreamlliner, TH500 and an old Eden WT. I want some opinions on how to get that old school sound and also what to know about the swithch in the back and the port plugs? Looking for that bass sound that surrounds you but can snap and sizzle with the Sterling and round wounds. Thanks Guys.