Seymour Duncan Seymour Duncan Modules Amplifier preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Seymour Duncan Modules Amplifier is a unique modular preamp system with swappable tonal modules, designed when Seymour Duncan briefly but ambitiously entered the amplifier market. It remains an obscure and fascinating artifact of 1980s American boutique amp design.

• Years produced: 1984–1990
• Made in: USA
• Preamp tubes: 4× 12AX7

Tags: american, modern.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.