Plugin Alliance Shadow Hills OptoMax 1.0.0 — macOS

The Shadow Hills OptoMax’s slow response setting does something you don’t hear every day — it lets the initial transient through and then eases the gain reduction in afterward. That’s the optical section of the Shadow Hills Mastering Compressor, ported into a plugin by Brainworx. It preserves the natural dynamics of a track while evening out the level, so you can apply gentle leveling or stronger peak control without the mix feeling clamped.

Response switch, threshold, and ratio controls

• Response switch: Slow, medium, and fast. Slow is for program-level smoothing on a bus or mix bus. Medium catches most material. Fast grabs peaks quickly, more like a limiter.
• Threshold and ratio: Standard compressor controls, but the optical circuit responds differently than a VCA or FET — softer knee, more natural release.
• Metering: The gain reduction meter shows how the opto cell is reacting. Version 1.0.1 fixed a Pro Tools meter issue.

Optical compression on tracks, subgroups, or the mix bus

This is a single-purpose plugin: optical compression from a known mastering hardware brand. It works on individual tracks, subgroups, or a mix bus, and the three response settings make it flexible enough for both subtle leveling and more aggressive peak control. The plugin runs on macOS 12 and later, Intel and Apple Silicon.

Transformer and high-frequency options

The three transformer types — nickel, iron, and steel — change the harmonic character of the compression. Nickel is the most neutral, iron adds a bit of midrange weight, and steel brings a harder edge. These aren't drastic changes, but they let you dial in a tonal flavor that fits the source material without reaching for another EQ plugin.

The high-frequency controls, Shine and Softness, work on the top end. Shine lifts air and presence a few dB after compression, so vocals or acoustic guitars don't lose their sparkle. Softness rolls off excessive sibilance or brittle highs. You can use one or both, and they stay effective even at subtle settings.

Start with medium response and 2-3 dB of gain reduction

When you first open the plugin, the response switch is the place to start. Set it to medium, then dial in 2-3 dB of gain reduction with the threshold. That gives you a baseline where you can hear how the opto cell behaves. From there, try the slow setting on a drum bus or a vocal track — you'll hear the transients stay punchy while the body of the sound gets evened out.

The parallel mix control is another early stop. It blends the compressed signal with the dry signal inside the plugin, so you don't need a separate parallel compression routing setup. This is especially useful on vocals where you want the natural performance preserved but need a little extra consistency in level.

Practical scenario: mastering engineer on a stereo mix

A mastering engineer working on a stereo mix of indie rock tracks can use the OptoMax for gentle leveling across the whole song. Set the response to slow, the threshold so the gain reduction meter shows 1-2 dB on the loudest sections, and the nickel transformer for the most transparent tone. The softness control can tame any harshness from the cymbals or distorted guitars without needing a separate de-esser. One pass through the plugin, and the mix feels more cohesive without sounding processed.

Works on individual tracks and the mix bus

Does it work on individual tracks or only the mix bus? It works on both. The response settings make it flexible enough for a vocal track or a full mix. The slow setting is more suited to program material, while fast can grab individual peaks on a bass or synth part.

Is the sidechain filter adjustable? The advanced sidechain filtering is built in, and it helps the compressor react to specific frequencies. You can filter out low end so the compressor doesn't pump on bass-heavy material, or focus the compression on the midrange for vocal clarity. The exact filter controls are part of the plugin's interface and respond in real time.

Does it replace the full Shadow Hills Mastering Compressor plugin? No. The OptoMax is only the optical section — the opto cell and the related controls. If you need the VCA or FET sections of the hardware, you'd want the full plugin. But if optical compression is what you're after, this covers that ground well.

Can I use it alongside other compressors? Yes. It works well as the first compressor in a chain for gentle leveling, followed by a faster compressor for peak control, or as the last compressor for final smoothing. The parallel mix control lets you blend it in without extra routing.

• Initial release of the Shadow Hills OptoMax plugin.

• macOS 12 or later
• Intel or Apple Silicon