Very good condition compressor in a very studio friendly half rack size. I used this on many projects and honestly it punches way above its price point.

The PreSonus BlueMax is a highly capable and versatile budget half-rack compressor. It is praised for its 15 handy quick-dial presets and a highly flexible manual mode. While the lack of a traditional threshold control can be slightly frustrating, it remains a favorite for budget-conscious home recordists and live sound.

Key Strengths

• Versatile Presets: The BlueMax features 15 "smart" presets (including vocals, acoustic guitar, and bass) that sound surprisingly good and get you the right amount of compression instantly. 
• Manual Control Flexibility: When flipped into Manual mode, you get full control over attack, release, and ratio (from 1:1 to 20:1). 
• Special Effect Settings: Users frequently point out that the two extreme effect presets, "Squeeze Guitar" and "Pump," add a unique, punchy character to drum loops and electric guitars. 
• Handy Metering: The unit provides clear, front-panel LED metering for input/output levels and gain reduction. 
• Sidechain Capability: It includes a sidechain insert jack, allowing you to easily perform techniques like ducking or de-essing.