Rotten Apple amp settings — Positive Grid Spark 40
The Alice N Chains guitar tone for “Rotten Apple”, dialed in for a Positive Grid Spark 40 with a Epiphone Les Paul Studio. Studio cut, Jar of Flies (1994) — signature talkbox/wah lead & atmospheric intro riff
G&L Rampage (Seymour Duncan JB) / '52 Goldtop into Heil Talk Box, Dunlop Wah, Bogner Fish preamp into Fender Twin Reverb & MosValve power amp
| Knob | Setting (0–10) |
|---|---|
| Gain | 6 |
| Bass | 6 |
| Mid | 7 |
| Treble | 5 |
| Reverb | 4 |
| Master | 6 |
01Auto Wah (or Touch Wah block in Spark Mod slot)
Simulates the iconic vocal Talkbox / cocked-wah filter on the signature riff
02Vintage Delay (Spark Delay slot)
Subtle warm analog slapback echo
03Plate Reverb (Spark Reverb slot)
Atmospheric decay
The Spark 40 has no dedicated physical presence knob, so top-end smoothing is dialed directly with Treble at 5. Your Les Paul Studio humbuckers naturally carry thick low-mids similar to Jerry's Duncan JB, so setting the guitar tone knob to 7 rounds off modern bite to emulate the vocal talkbox envelope. Use the Spark app's onboard auto-filter/wah block to nail the hollow talkbox phrasing without external hardware. Clean verse: roll guitar volume down to 5.
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These settings are for a Positive Grid Spark 40. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.
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