Mr Crowley amp settings — Yamaha GA-15
The OZzy Osbourne guitar tone for “Mr Crowley”, dialed in for a Yamaha GA-15 with a Jackson JS32 Dinky. Studio version, Blizzard of Ozz album (1980)
Marshall 1959 Super Lead 100W (cascade mod), MXR Distortion+, MXR 10-Band EQ, Karl Sandoval Flying V with DiMarzio Distortion Plus bridge pickup
| Knob | Setting (0–10) |
|---|---|
| Gain | 3 |
| Bass | 4 |
| Mid | 7 |
| Treble | 6 |
| Presence | 0 |
| Reverb | 0 |
| Master | 5 |
01Korg AX-1000G — Distortion Block (MXR Dist+ emulation or 'OD-1' type)
This is the primary gain source. Set amp gain LOW (3) because the pedal provides the saturation. Select the smoothest overdrive/distortion model available — avoid modern high-gain or metal voicings.
02Korg AX-1000G — EQ Block (Parametric or Graphic)
Critical for Rhoads' midrange bark. Boost 500Hz and 1kHz by +3-4dB, slight cut at 250Hz to tighten low-mids. Place AFTER the distortion block in signal chain.
03Korg AX-1000G — Chorus Block
Optional — use only for solo shimmer. Keep subtle. Recording was dry multi-tracked rhythm, but Randy used chorus live for thickness.
The Yamaha GA-15 is a solid-state practice amp with limited headroom and no channel switching — it cannot replicate Marshall power tube saturation. The Korg AX-1000G must supply ALL the gain and EQ shaping; the amp is set clean with mid pushed to 7 to compensate for its naturally flat voicing vs the Marshall's mid-forward character. Treble dropped to 6 because solid-state amps get harsh where tubes compress.
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These settings are for a Yamaha GA-15. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.
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