Tiny F (V0010) is a stripped-down version of Classic F. Tiny F uses about 10% of the CPU of Classic F, and it has ZERO software latency so has as fast a response as your hardware will allow. To achieve these goals, the tonestack is an approximation of the one in Classic F, the cabs are a set of filters rather than IRs, and the amp is single-channel, from either Left or Right input.
This amp does have the same improved distortion modelling as the most recent Classic Thirty, with a number of user-adjustable parameters for each tube stage. It has a two-stage preamp but can produce quite a bit of distortion if desired.
Tiny F includes both guitar and bass guitar amp sim capability. (For bass, be sure to reset the Low Cab Freq to something like 35 Hz!)..