● This is a modified Alesis 3630 Compressor. ◯ It's a 1U size, 2-channel combination of compressor and gate. The internal circuit is very simple, with only the signal passing through the input buffer ～ VCA ～ output buffer, resulting in very high sound quality. ◯ You can switch between Peak and RMS (average value). Peak is suitable for tightly controlling the attack of drums, etc., while RMS provides a natural compression effect for overall use. ◯ The sound quality is remarkably natural, with almost no change even when reducing by around 20dB. Being a 2-channel unit, it can be used for snare and kick, vocals and bass, or as a total compressor, making it useful for recording and live performances. The lack of tonal change and its small size and light weight make it convenient for live recordings. ◯ Modifications include replacement of power supply diodes and capacitors, metal film resistors in the signal path, tantalum capacitors for better sound, and the high-speed National Semiconductor LME49740 op-amp for improved sound quality. ◯ The gate has been replaced with a switchable potentiometer to allow bypassing. Turning the gate knob to zero clicks, bypassing the gate circuit. ◯ It's very popular in the US as a classic, with modification kits even being sold. It has been made into a VST plugin called NightShine, and searching will yield many articles. One site even nominated it as the 20th best compressor of all time, alongside legendary units like the Fairchild 670 and Urei 1176. ◯ Accessories include a general-purpose power supply and a self-made sidechain filter. The sidechain filter prevents compression on low frequencies, resulting in a more natural effect when used on a 2-mix. ◯ I always list the same item, but it's a different unit each time.