Parametric EQ with tilt and CV control, sweepable filter from subtle shaping to dramatic voicing.

Three-stage OTA phaser with 17-second cycle at slowest setting, Mix/Rate/Speed controls, Speed toggle offering glacial to near-ring-mod ranges plus full ring mod mode, released March 2023.

MKII parametric EQ with refined circuit, sweepable bands, and boost. Updated from the original ParaEQ.

Bass tone toolbox with 4th-order variable crossover and three exciters. Preserves lows while enhancing highs.

Compact clean boost with dual-band EQ in mini enclosure. Offers clean gain boost with minimal signal coloration.

Klon-based transparent overdrive with germanium/silicon clipping blend, clean mix, +12dB boost, and 4-band active EQ.

JFET-based bass preamp/DI featuring the iconic circuit Roger Sadowsky has built into his basses since 1979, with 2-band boost EQ and professional DI output, made famous by Marcus Miller and countless professional bassists.

EQ and boost for precise tonal adjustment. Sculpts tone with precise frequency control and boost/cut.

EF86 pentode tube preamp co-designed with Dr. Z—passive 3-band EQ, cab sim, and balanced XLR out.

Lower-gain PlexiTone variant focused on edge-of-breakup Marshall Plexi tones.

Analog mastering preamp with body/air EQ and 4-position voicing switch. Works at front or end of your signal chain.

Bass-optimized version of API's TranZformer pedal series with frequency ranges for low end.

9-series parametric EQ with sweepable mid frequency. More surgical tone shaping than graphic EQ allows.

3-band active EQ with 64 tone combinations. ARM Cortex-M controlled, 3 selectable frequencies per band.

Mini graphic EQ shaped like a chocolate cornet, Japanese precision in pocket format.

Interfax HP-1 clone. Adds even-order harmonics for tube-like warmth without harsh distortion.

VCA compressor pedal with API 527 circuit, 2510 op-amp, and transformer output.

Six-band graphic EQ in a compact pedal format. Slider-based frequency control for live tone adjustments.

Tri-Chorus edition of the Corona with SCF algorithm and stereo I/O. Three chorus voices stacked.

Analog signal processor adding warmth and widening stereo image. Fixes harsh digital pedal tones.

Dual bass boost with selectable low frequencies. Two bands of bass enhancement for thicker tone.

Tony Gambacurta's 10-band bass EQ with Constant Q design—±12dB per band, tour-proven since 1976.

Optical compressor with dry blend, 3-band active EQ, and 12dB clean boost in one box.

Ampeg VT-22 preamp EQ in a pedal—discrete transistor circuit for scooped mid-'70s amp tone.