API 200 series 225L CHANNEL COMPRESSOR/LIMITER: All discrete. Hard or soft knee – variable release – F,M,S attack – threshold – ratio – feedforward or feedback type compression – meter. The output level of the 225L always remains at unity. +4 balanced I/O. Brilliant in multiples for individual channel compression on mix down, interfaces easily with any desk, Pro Tools HD, or the API 8200/7800 .