AR Series · channel strip

LAP PEQ15

v3.5 · CLAP + VST3 · LINUX + WINDOWS
LAP PEQ15 - 19-inch 2U rack panel: five-band parametric EQ on the top row, input stage, noise gate AKL634, compressor AKL636C and expander AKL636E on the bottom row
Manual (PDF)

A complete channel strip built from circuit models: a five-band parametric EQ with a full VCA dynamics row - noise gate, downward expander and a soft-knee compressor/limiter - plus an opto input limiter in front of it all.

Input limiter → Noise gate → Expander → Parametric EQ → Compressor

Noise gateAKL 634

A comparator gate, not a soft one: opens near-instantly so transients never get clipped, holds open for 0–2 s with retrigger, then closes with a constant-rate ramp of 10–500 dB/s. Threshold −25…+5 dBu, sidechain key input, MIX as gate depth.

Downward expanderAKL 636E

The compressor circuit with its control path mirrored - below the threshold the gain falls away with the same soft knee. Ratio 1:1…1:3.94, RANGE caps the floor at 0–60 dB. For bleed and hiss without chopping decay tails.

5 fully parametric bandsPEQ15

Each band sweeps 10 Hz–21 kHz in three ranges (×0.1 / ×1 / ×10), gain ±18 dB, FRQ/WIDE bandwidth. State-variable filters with centre-tapped gain pots - the airy top end of the real hardware. Sweepable HP 10–250 Hz and LP 3–41 kHz.

Compressor / limiterAKL 636C

RMS-detected, feed-forward VCA compressor with a genuinely soft knee and the fixed, program-friendly time behaviour of its analogue control path. Ratios 1:1 to a 51:1 brick, ±18.5 dB make-up, sidechain, MIX for parallel compression.

Opto input limiter

GAIN ±20 dB and a Vactrol limiter with CEIL −24…0 dBFS in front of the whole chain, catching peaks before the strip sees them - timing from the VTL5C3 datasheet.

MIX is a real dry path

Below 100 % the dry signal dilutes the processed one: for the gate that is the depth of the cut, for the expander the floor, for the compressor plain parallel compression. Gate, expander and compressor are each switchable OFF / PRE / POST the EQ.

Stereo, LINK / L / R

Two channels from one set of controls with LINK, or dual mono - switch the panel to L or R and edit each side on its own. The whole path runs in an oversampled block (1× / 2× / 4×) so fast gain changes don't fold back into the audible band.

Hardware panel

A 19″ 2U drawing, screen-printed like the real thing; everything that moves is drawn live over it. Hover to read a value, double-click to reset, SCALE 1–5 picks the window size. Portable presets hold the whole strip.