Causey Audio Professional Audio

CauseyAudio

Analog drive & saturation

BC Drive

Two gain stages and a limiter, modeled on a legendary piece of mastering-grade hardware. Clean boost when you want it, harmonic saturation when you don't.

The BC Drive plugin interface, showing large Drive and Sat knobs with In, Sat and Lim indicator lamps
$29 Launch price $49

$49 is the regular price once the launch month ends. Introductory pricing applies for the first month after release.

One email at launch. No spam, and you can unsubscribe in one click.

Drive

Stage one

The gain stage. Pushes level into the circuit and sets how hard everything downstream is working. On its own it is transparent - measured at −141.5 dB THD, it is a boost, not a colour.

Sat

Stage two

The character stage, and a separate decision from Drive. Generates the full harmonic series that thickens low end and helps a track sit forward without simply being louder.

Lim

Output

The limiter catching the output stage. Holds the ceiling while the two stages ahead of it are pushed, so extra drive turns into density rather than into peaks you have to fix later.

The lamps track what the plugin is doing as you play: In for signal present, Sat when the saturation stage is contributing, and Lim when the limiter is working.

Measurements:

Two stages means the colour is yours to choose rather than something applied on the way past. These are harmonic analyses of BC Drive at both extremes, on a 200 Hz tone.

Harmonic spectrum at Drive 4 with no saturation, showing a single fundamental and no significant harmonics
Drive only. A single fundamental and nothing else above the noise floor. THD measures −141.5 dB — clean gain, no added harmonics.
Harmonic spectrum at full drive and full saturation, showing a dense series of harmonics extending upward
Drive and Sat, both wide open. A dense, evenly decaying harmonic series at −31.8 dB THD — the thickness, on demand.
Transfer curve showing an open hysteresis loop rather than a single line
The transfer curve opens into a loop. A static waveshaper would draw one line, because output would depend only on the current input. This one depends on what came just before it — the hysteresis that makes analog circuits respond to material rather than to samples.
BC Drive loaded as a VST3 on the master track of a digital audio workstation
VST3, on the master bus. Stereo in and out, with full preset handling and host automation.