Cory Miller

Vari-Mu compression is a fitting place to land in this series, because it pulls together everything you’ve learned so far—control, tone, and feel—but does it in a way that feels almost effortless. If FET compressors are about speed and attitude, optical compressors are about smooth leveling, and VCA compressors are about precision and glue, Vari-Mu compressors live in a more subtle space. They shape dynamics in a way that often feels invisible, yet undeniably impactful. The term “Vari-Mu”...

VCA compression is where things start to feel structured and controlled in a very deliberate way. If FET compressors bring speed and attitude, and optical compressors bring smoothness and feel, VCA compressors sit in a different lane altogether. They’re about precision, consistency, and control—often across multiple elements at once. This is the type of compression that starts to tie mixes together. A VCA (Voltage Controlled Amplifier) compressor works by using an electrical control...

Optical compression is a natural next step after FET, because it shows the other side of the spectrum. If FET compressors are about speed, edge, and control, optical compressors are about smoothness, tone, and feel. They don’t react as quickly, and they don’t try to. Instead, they move in a way that tends to sound more forgiving and more “musical” right out of the gate. At a technical level, an optical compressor uses a light source and a light-dependent resistor to control gain...