Opto-2A

The deal

$14.99 at KVR Marketplace (down from $139.00). Sale runs until June 1, 2026.

What it is

The Opto-2A is an optical tube compressor plugin modeled on the classic 1960s hardware unit. It replicates the distinctive T4 optical attenuator circuit - derived from military optical sensor technology - giving it the slow, transparent gain reduction that made the original a studio staple. The compression ratio shifts dynamically with the input signal, and a two-stage release mechanism adds a natural, musical quality that’s hard to fake with simpler designs.

Who it’s for

Producers and mixing engineers who want classic optical compression on vocals, bass, and broadcast material without reaching for outboard gear.

Key features

• Simple two-knob interface with Gain and Peak Reduction controls for fast, intuitive operation
• Fixed 10ms attack with a variable release starting at 60ms and extending up to 15 seconds depending on signal duration
• Two-stage release mechanism delivers the smooth, pump-free decay the original hardware is known for
• Switchable limiter mode for harder gain control when needed
• Available in VST3, Audio Unit, and AAX formats