That's cool man hopefully he lets that one out of his clutches lol. I am constantly fiddling with mine (only because my ears change everyday haha not the amps fault) but my current settings are as follow:
Into HI input
Volume -7
Deep-on
Mid Boost-on
Rock-on
Treble- 4.5
Middle-7.5
Bass-4.5
Drive-3.5
Level-2 (live in an apartment, this will soon change )
Master-1
Presence- 0-3 depending on the day the presence affects the overall brightness of the amp due to to the footswitchable midboost bypassing the tone circuit.
Power (knob in the back) at noon. Turn clockwise for more gain/saturation and counterclockwise for less gain and more articulation. Noon gives me a healthy helping of both.
Add a little reverb through the OTS and a DD-3 through the Jubilee and you'd be in business! Oh and the differences between the 50 and 100 watt Dumble style amps are really not that much due to the extreme headroom that the power section is designed for (HAD based his ODS power amp off of a Fender Dual Showman and Twin Reverb). Besides I get breathtaking tones with the level on 2 in an apartment so the mojo is all in the preamp IMO. They do sound cool cranked though, just not as dramatic a difference as with a Marshall circuit. Good luck Spider hopefully you can convince him to sell his OTS!!
'67 and '74 Fender Twin Reverbs, '74 Marshall 1987 lead mkII, Metro Superlead 100. Pedals from TC Electronic, Ibanez, Dunlop, BK Butler, Electro-Harmonix, Fulltone, Maestro/Gibson, Loopmaster switching, VoodooLab, Boss. Gibson and Fender guitars, Dimarzio pickups.