The bx_opto Pedal is a slimmed-down version of the bx_opto. It provides a great way to get that charismatic compression of the bx_opto with a simpler interface, lower price tag, and guitar pedal feel. After meticulously modeling the light-dependent circuits of several optical compressors, the bx_opto has amalgamated into a beastly little dynamics processor, teeming with character and spitting out sounds like no analog optical compressor can do. 

In addition to providing tone-laden compression, the bx_opto Pedal doubles as a gain pedal. By dialing-in the Density and Level Trim controls, you can add that little extra taste of gain and color that’s needed.

Most optical compressors are appreciated for their musical, program dependent character produced by the light dependent circuitry of the sidechain. They allow users the ability to adjust the effect of this character by introducing a separate resistance circuit that gives some control over the compression envelope.

Brainworx decided to take a different approach to adjusting this compression envelope when modeling the bx_opto and bx_opto Pedal. The modeled physical constant of the Light Dependent Resistor (LDR) was influenced by those of very real compressors, but there is no separate envelope circuit. Rather, the constant is directly manipulated by the ‘Speed’ parameter of the plugin. This introduces a whole different approach to sonic character that is impossible to replicate with a ‘real-world’ optical compressor.


  • The same optical compression circuit as the bx_opto
  • All in one sidechain input/makeup gain, ‘Density’
  • ‘Speed’ knob controls the modeled physical constant of Light Dependent Resistor, creating unique transient response
  • Output trim prevents overdriven signal from clipping
  • Guitar-pedal style power button

Audio Examples

Customer Reviews

  • ★★★★★
    BX_optp Pedal
    by Ebro
    It's allways the first in my guitarchain, ofcourse.
  • ★★★★★
    Opto Perfect
    by 77Stratman
    This little plugin is the perfect companion for the bx_rockrack, megasingle, megadual and Chandler amps. When you need that extra boost just select one of it's several presets and it will deliver!!
  • ★★★★☆
    bx_opto Pedal
    by Haetni
    A very useful plug-in when I'm quick to find a solution for guitar or bass.
  • ★★★★★
    by Chris Bernhardt
    Wow - no words - this is a red little beast ! Love it
  • ★★★★☆
    Opto Pedal
    by JimHam70
    This is a simple and easy to use plugin that works well on guitar and bass. Set it and forget it.


Supported Plugin Formats
AAX DSP, AAX Native, AU, AAX AudioSuite, VST2, VST3

Supported Operating Systems
Mac OS X 10.8 through 10.13
Windows 7 through 10
Pro Tools 10.3.10 or higher or any VST/VST3/AU-compatible host running on a supported operating system

Intel CPU only (minimum 2 GHz recommended)

Intel-compatible CPU with SSE2 instruction set (Pentium 4 compatible or higher; minimum 2 GHz recommended)

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM