Modern take on the ultra-rare Systech Harmonic Energizer, delivering resonant filter and harmonic enhancement effects.

2-band EQ with boost capability—tube-like warmth for level matching and frequency shaping.

6-band graphic equalizer for precise frequency shaping. Sculpts tone with precise frequency control and boost/cut.

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

Fender VibroVerb-inspired reverb and vibrato in one pedal. Classic American amp effects without the amp.

BC108C 70s-style fuzz companion to the Red Velvet with different voicing.

Professional-grade parametric EQ/gain pedal with studio-quality DI, based on the circuit Arthur Sloatman installed in all of Frank Zappa's stage guitars beginning in 1979, offering up to 55dB gain and surgical frequency control.

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

Always-on buffer/boost/EQ with Big Muff tilt-style tone control. Both knobs at noon = neutral buffer.

Transparent 3-band bass preamp with fully sweepable mids. A tone-shaping standard since 2009.

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

Black finish Ten Band EQ with same studio-quality 12dB cut/boost per band with same circuit as standard version.

Fortin-inspired 20dB clean boost with switchable preamp and two EQ voicings. 9V only.

Big Muff with Tone Wicker switches bypassing the tone stack and removing filtering for raw fuzz.

Guitar-optimized 3-band EQ with variable-gain preamp that can act as clean boost or overdrive.

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

Latest Boost-EQ with updated components and modern features. Same dual-band active EQ concept, refined.

Vox AC30-style overdrive with DC/DC converter for 12V internal operation and Cut control.

Tone-shaping boost and EQ combining level increase with frequency sculpting. Enhance your core sound.

BC183C silicon Fuzz Face variant with Mids, Feel, and Bass controls for extended versatility.

Seven-band graphic EQ for precise tone sculpting, affordable frequency control.

Nathan East signature bass parametric EQ with switchable Q curves (shallow/deep/flat)—9V battery, <2mA, 380g.

Sweepable mid-frequency EQ for bass. Dial in 120Hz-3kHz to cut through or add growl.

99-preset analog 10-band EQ with guitar-optimized frequencies and MIDI recall