An Optical Compressor Behaves Like Weather, Not Math
I put the Orvion OC-1 on a vocal bus last night expecting a cleaner version of a plugin I already own, and got something closer to weather. Nothing jumped. Nothing clamped. The level just quietly stopped being a problem, in a way I couldn't explain from the gain reduction meter alone.
Luxora Audio modeled the thing in four separate stages — an input transformer, the optical gain cell itself, a tube stage, an output transformer — instead of one block with a ratio knob standing in for all of it. That's the detail that actually matters here. Most compressor plugins model what a compressor does to level, as a curve. This one models the four physical places the signal changes shape on the way through a real chassis, which is a different and considerably harder thing to get right, and the one most plugins skip because nobody can hear it in a shootout video.
An optical cell doesn't compare level against a threshold the way a VCA does. It shines a signal-dependent light at a photoresistor, and the resistor is slow to brighten and slower to forget — which is the whole personality of the thing in one sentence. Fast transients get through before the light catches up, so a snare crack or a hard consonant survives untouched. Sustained level gets squeezed harder the longer it stays loud, then released on the photoresistor's own schedule, not a millisecond value I typed into a box.
On the vocal that meant the consonants stayed sharp and the held notes sat down into the mix on their own time, breathing with the phrase instead of snapping to a number I'd set an hour earlier and forgotten about. I didn't touch the release knob once, because there isn't one setting on it that matters as much as the cell's own memory does.
The meter on screen glows the same amber a real cell would, which is a cosmetic choice and I don't particularly care about cosmetics. What I care about is that I stopped riding the vocal fader by the second half of the chorus, because the compressor was already doing the listening for me.
On the wire this week
- Luxora Audio Releases Orvion OC-1 Optical Compressor Plugin Production Expert
Jonah Reyes was born in Daly City to Filipino parents, learned to solder before he learned to drive, and spent twelve years in Los Angeles rooms: a runner in Burbank, then an assistant, then mixing records nobody has heard of and a few everyone has. He now mixes from a small room in Echo Park and from whichever studio the work is in that month — Berlin, London, Tokyo, São Paulo — with one pair of monitors he trusts and a wall of pedals he does not need. He plays bass badly and on purpose. He will not write about a piece of gear he has not put a signal through.