● Modified Alesis 3630 Compressor. ◯ 1U rack size, 2-channel, a combination of compressor and gate. The internal circuit is very simple, with only the input buffer ～VCA ～output buffer in the signal path, resulting in very high sound quality. ◯ You can switch between Peak and RMS (average value) modes. Peak is suitable for tightly controlling the attack of drums, while RMS provides a natural compression effect for overall mixes. ◯ The sound quality is superb and natural. Even with a 20dB reduction, there is almost no change in sound quality, making it difficult to tell it's even compressing. 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 both recording and live performances. The minimal change in sound color and its small, lightweight design 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-amps for improved audio quality. ◯ The gate has been modified with a switchable potentiometer to bypass it. Turning the gate knob fully counter-clockwise clicks, bypassing the gate circuit. ◯ It is very popular in the United States as a legendary unit, and modification kits are even sold. It has been made into a VST plugin called NightShine, and searching will yield many articles. One website even nominated it as the 20th best compressor of all time, alongside legendary units like the Fairchild 670 and Urei 1176. ◯ Accessories include a generic power supply and a custom-made sidechain filter. The sidechain filter prevents compression of low frequencies, resulting in a more natural sound when used on 2-mixes. ◯ I always list the same item, but each time it is a different unit.