I am curious to see if any other Dem 201S owners get similar results with various tone settings as I do or if my case is particular to the combination of bass guitar (SR5), tubes (one Russian and one Chinese--not sure which is in which position), amp (QSC PLX1602), & cab (Bergantino HT322) I use. If some of you could try this and let me know the results, I would appreciate it. ToneSet#1: With everything on the preamp set flat and all the switches out, I get a ballzy, warm tone that is fairly articulate and solid. The low end and lower mid-bass has just a bit of smooth raggedness (a little bit of overdrive and compression, the harder it's driven, the more pronounced it becomes, but always stays pretty smooth). ToneSet#2: I noticed that if I have problems cutting through live, I can boost the articulation by engaging the Bright switch (& usually cut the treble & mid control on my SR5 just a little to keep string/fret noise under control). This seems to affect the entire sonic range of the bass all the way down to Low B; tightens everything up a noticable amount and cuts through really well. I usually boost the bass control on my SR5 just a little to keep string volume even. ToneSet#3: If I want more of the overdriven tone, I disengage the Bright and engage the 120Hz Low Freq switch and boost the midrange a little (usually on my SR5). I can get even more of the effect by switching my SR5 from Single coil mode to Parallel. I don't have to change the rotary tone controls on the preamp at all to get these effects. Can some of you check and see if you get similar results?