We switched on the FATSO, sent a signal through it, and were impressed. Experimenting is allowed, encouraged, and rewarded. The EL7 is easy to use and offers incredible versatility as long as you stick to the high-frequency range. With low-frequency signals, the FATSO is rather unobtrusive and muddy at extreme settings. This device truly gives you the ability to “paint” tones and enrich the signal with brilliance. Whether it’s giving a vocal signal more presence (speech intelligibility) or generating greater compression in a stereo mix (a veritable wall of sound), it’s a real ear-opener. Caution is advised with extreme settings! Likewise, once the settings are successful, you tend not to re-evaluate a new signal. Preset warning! It’s a joy to use! Anyone who has one can consider themselves lucky. “Producer tool” is probably the right term for the FATSO. A second-to-none sonic/musical addition to any studio!