Tone library / Acid bath / Dope fiend

Dope fiend amp settings — Line 6 Spider iv 75

The Acid bath guitar tone for “Dope fiend”, dialed in for a Line 6 Spider iv 75 with a Jackson JS32 Dinky. Studio version, When the Kite String Pops (1994) — main heavy sludge riff

Original rig

Ampeg VH-140C solid-state head / Marshall JCM800, Gibson Flying V / Les Paul with humbuckers, Boss HM-2 / SD-1 boost

Abrasive, saturated 90s sludge metal with crushing low-end, grinding upper-mids, and sharp solid-state bite
Amp settings — Line 6 Spider iv 75
CHANNELMetal (Green/Red LED)BOOSToff
GAIN 6 BASS 7 MID 4 TREBLE 7 REVERB 0 MASTER 4
KnobSetting (0–10)
Gain6
Bass7
Mid4
Treble7
Reverb0
Master4
Don’t have a Line 6 Spider iv 75? Match your own rig →
Guitar
PICKUPbridge TONE10 VOLUME10
Signal chain

01Boss SD-1 Super Overdrive

Tightening boost in front of the amp; cuts flubby sub-bass for C tuning

Drive 1 · Tone 6 · Level 8

02Boss NS-2 Noise Suppressor

Essential for cutting the hiss and feedback from stacked high gain

Threshold 7 · Decay 2

03MXR M108s

In front into amp input (or in FX loop if available); pushes low thump and 1-2kHz aggressive Ampeg clank

Volume 5 · Gain 5 · 31.25Hz 4 · 62.5Hz 6 · 125Hz 7 · 250Hz 5 · 500Hz 4 · 1kHz 6 · 2kHz 7 · 4kHz 5 · 8kHz 4 · 16kHz 3
Why these settings

The Spider IV runs inherently hot on its Metal and Insane models, so keeping gain around 6 avoids fizzy digital mush while matching the Ampeg VH-140C's solid-state saturation. The SD-1 is used strictly as a boost (Drive near zero, Level pushed) to tighten the loose low end of Drop C tuning before hitting the preamp. The MXR 10-band sculpts the gritty 1k–2k upper mids that defined Sammy Duet's razor-sharp sludge tone. Clean interlude: switch to the Clean channel and bypass the SD-1.

PRO TIPAcid Bath tuned to Drop C (C-G-C-F-A-D); hit your power chords with aggressive, heavy downstrokes right near the bridge saddles to get that metallic percussive chug without bass flub.

Get this tone on your amp

These settings are for a Line 6 Spider iv 75. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

Get ToneAdapt on Google Play
More tones for the Line 6 Spider iv 75
Master of PuppetsMetallicaShoot to killPeelingfleshPeople = shitSlipknotGematriaSlipknotToxicitySystem of a downTears dont fallBullet for my valentine
Find your amp
Browse
Line 6 Spider iv 75 settingsALL SONGS FOR THIS AMP Acid bath tonesALL SONGS Jackson JS32 Dinky tonesSAME GUITAR Tone libraryEVERYTHING

Song, artist and gear names are used to identify the tone being matched; ToneAdapt is not affiliated with or endorsed by the artists or manufacturers mentioned. Settings are AI-generated starting points — trust your ears.

Get ToneAdapt — first match free