The Focusrite ISA 220 Session Pack is a complete voice processor for professional audio production, offering a mic pre, EQ, compressor, de-esser and limiter. Line and instrument-level inputs allow processing of any source. The onboard compression makes this a popular unit for recording drums, and bass guitars gain depth and presence.

Features:
• VU metering of input level or compressor gain reduction (switched)
• 16 LED digital output meters for both internal and external inputs
• classic Focusrite transformer-based mic preamp
• switched high- and low-pass filter controls
• switched high- and low-shelving filter frequency controls
• proprietory Focusrite discrete Class A VCA compressor side chain design for lower distortion and noise performance
• illuminated push button for switching the compressor between pre and post EQ
• new "Blend" feature for adding dynamics into the compressed signal path
• new De-esser design based on optical technology for lower distortion and transparency
• De-esser Listen for precise control over sibilance
• frequency adaptive limiter to avoid critical digital overs