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_opto pedal
    by tomb
    Very good sounding opto compressor, finds it's way into a lot of mixes. It has some beef to it which is good, the little light for a meter is not, but I guess tha's reserved for it's bigger brother.… Read More
  • ★★★★★
    by Yamahaguitark
    This little compressor gives me all the dynamic control of an expensive plugin. I use it primarily on guitar and bass tracks, but it has also done wonders on drum tracks. Bravo Brainworx!
  • ★★★★★
    Finally I gotcha!
    by Faland
    Tried so many compressor pedals in so many Guitar "suites" that I almost lost any hopes to find a right compressor for my need. The opto_Pedal is it. 49 bucks? Wait for a sale, but don't try this… Read More
  • ★★★☆☆
    Not Bad
    by Ahmed Boareki
    tonally it sounds great, but nothing special about it , it is simple but limited , I personally don't know when to use it because I do have better options.
  • ★★★★★
    Bx_opto Pedal
    by Petrahelo
    One plugin that must be present on the bass track. its combine the compresor and saturation with very musical ways


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

Supported Operating Systems
Mac OS X 10.8 through 10.12
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


With the Installation Manager, you can select, download and install just the Plugin Alliance products and formats you need for your system. During this initial release, we at Plugin Alliance look forward to hearing the feedback of our valued customers, as your input will help shape future versions of this utility.