The Atlas III is a medium-gain preamp booster. While staying relatively clean and transparent, the Atlas III adds subtle color and harmonic overtones, which become more apparent as you increase gain. Specifically created for pushing the front end of tube amps, the Atlas III was designed to do so in a rich, warm way; while adding a touch of sparkle in the highs, and never muddying up the lows. The net result is a very natural sounding gain, without over-emphasizing any specific frequency range. The Atlas III obtains this tasteful organic coloration via its discrete preamp design. The gain control is completely useable throughout its full rotation. Plenty of gain to overdrive your amp's tubes, without melting anything (probably).