Behringer BX1200 Ultrabass preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The BX1200 Ultrabass is a 120-watt solid-state bass combo with passive and active inputs, two gain controls, a Shape filter, a 4-band EQ and the Ultrabass sub-octave effect. It is an inexpensive practice and small-gig bass amp with a wide range of tone controls.

• Wattage: 120W
• Channels: 1

Tags: solid-state, bass, practice, modern.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.