808BD — CALIBRATION INSTRUMENT

16 STEP SEQUENCER
MASTER
CALIBRATION — SOUND GENERATION PATH

1 — EXCITATION

Initial trigger which excites the resonant system.

TRIGGER WIDTH
TRIGGER LEVEL

2 — ATTACK / PITCH TRANSIENT

Short initial resonance before the low-frequency body dominates.

ATTACK FREQUENCY
ATTACK TIME
ATTACK AMOUNT

3 — RESONATOR

Core low-frequency body. Front-panel Length primarily changes damping/decay.

BODY FREQUENCY
RESONANCE / Q
DAMPING TRIM

4 — RETRIGGER

Secondary excitation shaping the transition into the body.

RETRIGGER DELAY
RETRIGGER AMOUNT
RETRIGGER TIME

5 — TONE / OUTPUT

Final frequency shaping corresponding to the output tone path.

TONE FILTER FREQUENCY
TONE FILTER Q

6 — EXCITATION / BODY BALANCE

Bench controls for comparing transient and resonant body contributions.

BODY EXCITATION
CLICK AMOUNT
CIRCUIT / SIGNAL PATH REFERENCE
TRIGGER | v +----------------+ | PULSE / | 1 EXCITATION | EXCITATION | +-------+--------+ | v +----------------+ | ATTACK / | 2 PITCH TRANSIENT | TRANSIENT | +-------+--------+ | v +---------------------+ | BRIDGED-T STYLE |<-------------+ | RESONATOR | | | LOW-FREQUENCY BODY | | +----------+----------+ | | | +-------------------------+ FEEDBACK / DAMPING | v +----------------+ | RETRIGGER | 4 RETRIGGER +-------+--------+ | v +----------------+ | TONE / OUTPUT | 5 TONE / OUTPUT +-------+--------+ | v OUTPUT Front-panel LENGTH -> resonator damping / decay Front-panel TONE -> output tone character Front-panel VOLUME -> output level
Functional reference, not a transistor-level reproduction. Calibration controls are deliberately exposed as engineering/bench parameters so the model can be tuned against the behaviour of the original hardware.
Version 3.1.0 — calibration-oriented experimental model.