I bought the AMT E-2 as a back up to my ENGL Screamer and to allow me to get descent tones from situations where I am presented with an unknown amplifier. The E-2 can be used in 3 modes as a stomp box , as a pre-amp and as pre-amp with cabinet simulation for recording or direct to mixing desk applications. Although Ive used the stomp box and cab sim modes its as a pre-amp was my main interest. Ive used with Marshall, ENGL, HiWatt and Peavey amps, plugging into their FX return loops .. and in every case it excels and IMHO beats or runs close the internal preamps of those amplifiers (runs the ENGL close) only with the cost of a slight increase in noise. Using the AMT E-2 in this way it is never off as the non-ENGL footswitch position becomes a Fender emulation. I have now linked this to an AMT V-1 (Vox emulator) and fitting in the E-2 into the V-1s effect loop has given me a Clean-Crunch-Lead set-up.