Sooooo All things between DSL / TSL? I have the TSL 60, ripping amp thus far. Very nice amp all around, but I got it to .. mix and match cab simulators at in put. I have three cab simulators I will be using for now. And as I also have an Hughes and Kettner, Tubeman 2 and also Vox Cooltron "Snake Charmer" tube compressor. a few other tube preamp floor units or some sort. I will be using a UP Town Technologies Flash 4 as a switcher. My point is ..... the basic sound of the Marshell can't be beat, and with that as a basis I am sure I will find any and all sounds I may need, or if I may need/ I have three Digitech RP 20, RP-21d units as well. I am forcing myself to leave out anything about the ADA GCS-6 Stereo Guitar Cabinet Simulator I will add also that the DSL and TSL all have very nice effects loops to mix and match signal enhancing, very very nicely designed for getting the tubes to react in many different ways. I am going to be building up the guitar signal before even getting to the marshell tubes. So far things have been very good and more amazing then anything. I am thinking along the lines of early 80s and late 80s sounds built using two or three marshell amps as preamps, this is where all these designs came from. Marshell took notes on how every one was building racks and recording LPs? And then they built the best "easy" amp to get the same sounds from the pre amps of the marshell line ups, this is where the DSL / TSL thinking lays. Play around with what your signal is doing before it gets in to the marshell, learn the right way to "boost" your guitar signal before the amp in put. Bob Bradshaw and MXR have a nice pedal for this as well. Its the MXR® CAE BOOST/LINE DRIVER TC Electronics has the Spark just for this as well. So so many more ways to shape your sound and get the tubes to really light up any way you want. I will do a follow up on this at some point and toss in some even more complex issues of getting tube amps to really shine and sparkle any way you like.