I got a question that's been bugging me, since I never mess with the old style reverbs (Fender stand alones, or the Fender amp that has this feature in it)... what exactly does the dwell control on a reverb do? Is it a gain control for how hard the stage is driven ? What does it do sonically, most I've seen have dwell, tone,and level or mix (the *reverb control* as such... ie, the amount of reverb). What does it do exactly, does it have something to do with the volume of the reverb itself versus it's length of decay? Thanks.