Featuring four VCAs, 6 compression ratios, 10 attack times, sidechain filters for high-pass, boost and slope, wet/dry mix control, external (key) input, classic step-by-step release settings, classic and alternative auto-release, variable release control, and ‘Grind’ mode (a proprietary tube-style harmonic drive that adds vintage character), the SB4001 delivers exactly the sound you need. Whether clean, dirty, vintage, subtle or hard-hitting – the SB4001 is sure to be one of the most versatile compressors in your arsenal.