ALLOMORPH: STANDARD JAZZ BASS EDITION
Transform your stock Fender Jazz Bass into 21 legendary active, vintage, modern, and acoustic pickup configurations.
OVERVIEW
Allomorph is the first collection of pickup and control-harness digital twins engineered for Neural Amp Modeler (NAM) and the Darkglass Anagram pedalboard.
Rather than modeling an amplifier or speaker cabinet, these models capture the fundamental electro-acoustic physics of:
• Pickup coil inductances, eddy currents, and DC resistance
• Magnetic aperture geometry and spatial string comb-filtering
• Era-accurate potentiometer loading and tone capacitor values
• Instrument cable capacitance drag (750 pF)
• Pure capacitive ToneStyler shunts eliminating wiper mud
• Active onboard discrete preamps and EQ buffers
• Non-linear magnetic core saturation and dynamic string compliance
This edition is specifically calibrated for a 34" Standard Jazz Bass with stock passive single-coil pickups. Through exact differential deconvolution, Allomorph neutralizes your stock pickups' loaded electrical resonance and spatial aperture, reconstructing the authentic acoustic and electrical twin of each target instrument in real time.
RECOMMENDED SIGNAL CHAIN
Place Allomorph as the very first block in your signal path:
[Fender Jazz Bass]
-> [Block 1: Allomorph NAM Preamp] (Input / Pickup Front-End)
-> [Block 2: Amp / Drive / Preamp] (Darkglass B7K, SVT, B-15, etc.)
-> [Block 3: Speaker Cabinet IR] (8x10, 4x10, 1x15, etc.)
-> [FOH / Audio Interface / DAW]
Why Block 1? Drive and preamp circuits react directly to pickup resonant peaks. Placing Allomorph first ensures downstream pedals distort authentic vintage or active resonant envelopes rather than an unshaped DI.
QUICK INSTRUMENT SETUP
For each voicing, set your bass's physical pickup controls to the recommended bracketed setting [Parallel], [Neck], or [Bridge]:
• [Parallel]: Neck Volume 100% | Bridge Volume 100% (Both Pickups Wide Open)
• [Neck]: Neck Volume 100% | Bridge Volume 0% (Solo Neck Pickup)
• [Bridge]: Neck Volume 0% | Bridge Volume 100% (Solo Bridge Pickup)
• Master Tone Knob: 100% (Wide Open across all models)
Plug straight in. All impedance matching, aperture repositioning, pot loading, and discrete preamp EQs are handled automatically by the NAM models.
THE 21 DIGITAL TWIN VOICINGS
Jazz Bass Family
01. Modern Active Jazz Bass (NYC 2-Band) [Parallel]
Sadowsky-style active 2-band buffer with cable isolation (1M in, 100 ohm out). Coils resonate freely at ~7.8 kHz without cable drag. Delivers wideband sparkle, tight low end (+4 dB @ 40 Hz), crystalline treble (+4 dB @ 4 kHz), and authentic 60s dual-aperture midrange scoop.
02. Vintage '60s Jazz Bass Pair (Parallel) [Parallel]
Authentic 1960s dual single-coils in parallel (3 5/8" spacing) loaded by dual 250k volume pots (125k net) and a 47nF cap. Natural woody low-mid resonance (2.7 kHz peak) with classic wide-aperture phase cancellation at 1 kHz.
03. '60s Jazz Bass Pair (22nF ToneStyler Sweet Spot) [Parallel]
Dual single-coils with a 22nF ToneStyler pure capacitive shunt. Eliminates wiper resistance to produce an undamped 762 Hz vocal midrange bump (-3 dB @ 1225 Hz), filtering clank while preserving aggressive Jaco/Miller bridge bite with zero wiper mud.
04. '60s Jazz Bridge Growl (Jaco Bias) [Parallel]
Classic Jaco fingerstyle setting: run both pickups wide open on your bass while the model injects 55k ohms of series neck wiper decoupling resistance under the hood. Pulls the acoustic comb notch into the vocal 550–800 Hz zone for signature growl and burp.
05. '60s Jazz Bridge Single-Coil [Bridge]
Authentic 60s bridge single-coil datum (63.5mm from bridge). Narrow 0.75" aperture loaded by vintage 250k pots. Focused midrange bite (800 Hz–1.6 kHz) with articulate, percussive staccato finger attack.
Precision Bass & Tone Shaper Family
06. Modern Ceramic Split-P (Boutique 500k) [Neck]
Transforms your neck pickup into a high-inductance ceramic split-coil (Bartolini 8CBP spec, 4.8H) with boutique 500k pots, 22nF Orange Drop cap, and hybrid treble bleed. Tight transient clamp with aggressive high-mid pick presence.
07. Vintage '62 P-Bass (Alnico V - Tone Open) [Neck]
Iconic 1962 Fullerton Alnico V split-coil (3.8H) with vintage CTS 250k pots and 47nF paper-in-oil cap wide open. Lower eddy damping yields organic touch sensitivity, woody bloom, and open harmonic extension (2.1 kHz loaded peak).
08. Vintage '62 Split-P (22nF ToneStyler Punch) [Neck]
Vintage '62 split-coil with a modern Fender-spec 22nF ToneStyler pure capacitive shunt. Concentrates energy into an undamped, punchy 440 Hz low-mid peak (+1.5 dB, -3 dB @ 750 Hz), eliminating fret rattle while retaining forward mix punch.
09. Vintage '62 Split-P Motown Thump (47nF ToneStyler Flatwound) [Neck]
Legendary Jamerson/Pino flatwound tone: vintage Alnico split-coil with 47nF ToneStyler pure capacitive shunt and flatwound string damping. Resonant peak at 450 Hz with steep rolloff above 800 Hz for pillowy sub-bass mass and zero clatter.
10. Vintage '50s Split-P Deep Dub (100nF ToneStyler Fullerton Spec) [Neck]
Original 1951–1959 Fullerton factory 0.1µF (100nF) paper-in-oil spec with zero wiper damping. Massive sub-bass shelf rolloff (-3 dB @ 240 Hz) for subterranean dub and reggae thump that shakes the room without mud.
P/J & Music Man Family
11. Modern Active P/J Bass [Parallel]
Compound 3-coil array: ceramic split-neck and single-bridge with active 2-band buffer (1M in, 100 ohm out). +4 dB bass boost at 40 Hz, +4 dB treble at 4 kHz, and cable isolation (7.6 kHz resonance). Aggressive slap snap with thunderous low-end weight.
12. Vintage '80s Passive P/J Bass [Parallel]
1980s Fender Jazz Bass Special / Yamaha BB3000 style Alnico V split/single pair in parallel with dual 250k volume loading (125k net). Thick hard-rock punch, woody mid bite, and authoritative low-end grunt.
13. Music Man StingRay (Active 2-Band Parallel Humbucker) [Bridge]
Parallel dual-coil humbucker centered at 66.0mm from bridge with onboard active 2-band preamp buffer (+5 dB bass @ 50 Hz, +3 dB treble @ 7 kHz). Complete cable isolation (7.2 kHz resonance), 2.5 kHz hollow mid-scoop, and signature metallic clank.
14. Music Man StingRay (Active 2-Band Series Humbucker) [Bridge]
Dual-coil humbucker in series (4.0H) with active 2-band preamp buffer. +2.5 dB hotter output with aggressive 2.1 kHz midrange bark and softened treble clank. Captures the punchy series toggle setting of the StingRay 5 and Sterling.
Progressive, Rock & Acoustic Transducers
15. Rickenbacker 4003 Bridge (4.7nF HPF) [Bridge]
High-output single-coil loaded with factory 330k pots and vintage 4.7nF series high-pass cap circuit. Strips sub-bass mud below 150 Hz while focusing aggressive midrange grit and pick attack (1.5–2.5 kHz) for classic prog clank.
16. P/MM Hybrid (Series Sum) [Parallel]
Compound 4-coil array: Precision split-coil and Music Man humbucker wired in series (7.2H inductance, 500k harness). Massive +5.8 dB voltage boost with a forward, muscular 1.6 kHz punch and wall-shaking low-mid authority.
17. Gibson Mudbucker Ultra Series [Neck]
Overwound sidewinder series humbucker placed at neck heel (165.0mm datum, 14.4H inductance, 500k harness). Resonant peak pulled to 1.2 kHz with steep natural acoustic rolloff. Colossal subterranean low end with zero fizz—ideal for fuzz and heavy riffing.
18. Dingwall Fanned Multi-Scale Bridge [Bridge]
Dual-coil humbucker at the angled bridge sweet spot (48.0mm datum) of a 34"–37" fanned-fret bass with 500k pots and stainless roundwound string physics. High wave-speed clank and FD3 dual-coil parallel resonance (3.4 kHz) for modern metal and djent.
19. Upright Acoustic Double Bass (Bridge Piezo Transducer) [Neck]
Direct bridge force transducer simulation (Underwood/Realist style on 41.5" double bass scale) with velocity-to-force integration (+6 dB/oct from 70–250 Hz), 32 Hz rumble cut, and spiral rope-core dynamics. Delivers woody pizzicato bloom and warm acoustic body resonance.
Studio Buffers & Dynamics
20. Modern Studio Active Buffer (Zero Cable Loading) [Parallel]
Studio-grade ultra-high-impedance active buffer twin (1M in, 100 ohm out). Deconvolves 750 pF cable capacitance and dual 250k pot damping from your stock Jazz pickups without changing coil position. Shifts resonance to 7.5–9.0 kHz for pristine pick attack, ultra-fast transients, and sparkling hi-fi air.
21. Passive Character (Dynamic Baseline / True Bypass Reference) [Parallel]
Pure passive dynamic twin with bit-exact 0.00 dB flat response (20 Hz–20 kHz). Calibrated to your stock Jazz Bass's natural Alnico V dynamics and output staging. Serves as a transparent baseline reference for seamless A/B comparison and unity front-end routing.
LICENSE & DISCLAIMER
License:
These neural model files are licensed for personal and commercial musical performances, recording, and production. Redistribution, sublicensing, or resale of the raw model files or derived profiles without permission is strictly prohibited.
Trademark Disclaimer:
All product names, trademarks, and registered trademarks (such as Fender, Precision Bass, P-Bass, Jazz Bass, J-Bass, Music Man, StingRay, Sterling, Rickenbacker, Gibson, Dingwall, Bartolini, Sadowsky, Spector, ToneStyler, EMG, and Darkglass) are the property of their respective owners. These names and references are used solely to identify the historical instruments, physical pickup architectures, and analog circuits analyzed and modeled in this project. Allomorph is an independent project and is not affiliated with, sponsored by, or endorsed by any of these manufacturers.
