Roland Jazz Chorus JC-120 Settings Guide
The Roland JC-120 Jazz Chorus is one of the most influential amplifiers ever made, introduced in 1975 and unchanged in fundamental character since. A solid-state 120-watt stereo amp with built-in stereo chorus, it produces one of the cleanest, most transparent tones available from any amplifier. The JC-120 is the definitive choice for jazz, funk, and clean-tone genres, and has been used by artists across a remarkable range of styles: from Andy Summers and Robert Smith to Albert King and Radiohead.
Used by: Robert Smith, Andy Summers
The best Roland Jazz Chorus JC-120 settings start with: Volume at 6/10, Bass at 5/10, Middle at 5/10, Treble at 6/10, Chorus Rate at 4/10, Chorus Depth at 3/10, Vibrato at 0/10. Adjust from there based on your amp, guitar, and room volume. For Jazz: Volume 6/10, Bass 6/10, Middle 6/10, Treble 4/10, Chorus Rate 0/10, Chorus Depth 0/10, Vibrato 0/10.
⚡ Start Here — Recommended Settings
| Control | Starting Position | Range |
|---|---|---|
| Volume | 6/10 | Silent → Full |
| Bass | 5/10 | Cut → Boost |
| Middle | 5/10 | Cut → Boost |
| Treble | 6/10 | Dark → Bright |
| Chorus Rate | 4/10 | Slow → Fast |
| Chorus Depth | 3/10 | Subtle → Maximum |
| Vibrato | 0/10 | Off → Maximum |
These are universal starting points. Adjust based on your amp, guitar, and room. Scroll down for genre-specific settings and artist-documented positions.
What Each Control Does
Recommended Starting Settings
Safe starting positions for any style. Adjust from here based on your amp and room.
All values on a 0–10 scale. These are starting points — fine-tune by ear.
Settings by Genre
Pure clean tone with no chorus. Treble 4 produces the warm, round character preferred in jazz. Bass and Middle up to provide a full, authoritative tone. The JC-120 without chorus is one of the finest jazz amplifiers ever made — its solid-state character actually suits jazz's demand for frequency-honest amplification. A guitar's natural pick attack and wood resonance come through accurately.
Bright, clean, and percussive for the cutting funk clean tone. Treble 7 adds the upper-frequency bite needed for funk rhythms to cut through a horn section. Use a wah pedal and envelope filter in front of the JC-120 — the amp's transparency lets both effects perform at their best. No chorus.
The JC-120 suits blues when played at higher Volume settings where the solid-state preamp starts to produce its characteristic slight overdrive. Middle 7 adds the vocal blues tone. For overdriven blues, place a Tube Screamer or Blues Driver in front and let the JC-120 remain clean while the pedal drives.
The JC-120 with its built-in chorus at moderate depth is the quintessential indie rock clean tone — used by The Cure, New Order, and many 80s post-punk bands. Chorus Rate 4 (moderate speed) with Depth 5 produces the shimmering wash without sounding artificially processed.
Run a Marshall-style overdrive pedal (OCD, Blues Breaker, or Hot Cake) in front of the clean JC-120 for classic rock tones. The amp's clean headroom means the overdrive character comes entirely from the pedal — a very different approach to a cranked Marshall but effective for controlled, studio-quality distortion.
Artist Settings
Documented settings used by professional guitarists on this unit.
The Cure's Robert Smith built his signature sound entirely around the JC-120 with built-in chorus. Chorus Depth 6 at Rate 4 produces the shimmering, slightly watery tone heard on Disintegration and Boys Don't Cry. Combined with a Roland Space Echo and his Roland GR-300 guitar synth, this is the classic The Cure clean tone.
The Police's Andy Summers used a JC-120 as his main amp throughout the band's classic period. His approach: chorus at higher depth, combined with a Roland RE-301 Space Echo and various modulation pedals. The Chorus Depth at 7 produces the distinctive shimmering that characterises Every Breath You Take.
Tips & Common Mistakes
- The JC-120's built-in stereo chorus sounds better than virtually any chorus pedal you can buy — don't bypass it in favour of a pedal unless you specifically need a different sound.
- The JC-120's Distortion channel (on models that have it) is not its strength — the amp is unmatched for clean tone. Drive any overdrive from an external pedal.
- The amp responds extremely well to playing dynamics — your pick attack, picking position, and volume knob on the guitar all come through accurately. Practising on a JC-120 teaches good technique.
- In stereo configurations, connect two JC-120s or use the stereo outputs — the stereo spread of the chorus at full width is spectacular for ambient and post-rock styles.
- The JC-120 works exceptionally well with bass-heavy chords (open tunings, drop-D) because the solid-state power amp handles the low end with more authority than typical tube amps of similar wattage.
FAQ
Roland Jazz Chorus JC-120 — Common Questions
Best starting settings for Roland Jazz Chorus JC-120: Volume at 6/10, Bass at 5/10, Middle at 5/10, Treble at 6/10, Chorus Rate at 4/10, Chorus Depth at 3/10, Vibrato at 0/10. Adjust from there based on your guitar, room, and playing style.
For Jazz: Volume 6/10, Bass 6/10, Middle 6/10, Treble 4/10, Chorus Rate 0/10, Chorus Depth 0/10, Vibrato 0/10. Pure clean tone with no chorus. Treble 4 produces the warm, round character preferred in jazz. Bass and Middle up to provide a full, authoritative tone. The JC-120 without chorus is one of the finest jazz amplifiers ever made — its solid-state character actually suits jazz's demand for frequency-honest amplification. A guitar's natural pick attack and wood resonance come through accurately.
For Funk: Volume 6/10, Bass 5/10, Middle 5/10, Treble 7/10, Chorus Rate 0/10, Chorus Depth 0/10, Vibrato 0/10. Bright, clean, and percussive for the cutting funk clean tone. Treble 7 adds the upper-frequency bite needed for funk rhythms to cut through a horn section. Use a wah pedal and envelope filter in front of the JC-120 — the amp's transparency lets both effects perform at their best. No chorus.
Volume: Clean channel output volume. At higher settings, the solid-state preamp produces a subtle, pleasant clipping character distinct from tube breakup. (Silent to Full). Bass: Low-frequency tone control. The JC-120 bass response is wide and authoritative. (Cut to Boost). Middle: Mid-range tone control — the JC-120's midrange is particularly smooth, lacking the nasal character of many solid-state amps. (Cut to Boost). Treble: High-frequency tone control. At maximum Treble, the JC-120 produces a crystalline sheen that defines its iconic character. (Dark to Bright). Chorus Rate: Chorus LFO speed. The JC-120's analog bucket-brigade chorus is widely considered the finest built-in amp chorus ever produced. (Slow to Fast). Chorus Depth: Chorus intensity. Even at maximum depth, the JC-120's chorus avoids the artificial quality of digital approximations. (Subtle to Maximum). Vibrato: Engages vibrato mode (pitch modulation rather than amplitude/pitch chorus). Creates a dramatic warble effect used in psychedelic contexts. (Off to Maximum)
The JC-120's built-in stereo chorus sounds better than virtually any chorus pedal you can buy — don't bypass it in favour of a pedal unless you specifically need a different sound. The JC-120's Distortion channel (on models that have it) is not its strength — the amp is unmatched for clean tone. Drive any overdrive from an external pedal. The amp responds extremely well to playing dynamics — your pick attack, picking position, and volume knob on the guitar all come through accurately. Practising on a JC-120 teaches good technique. In stereo configurations, connect two JC-120s or use the stereo outputs — the stereo spread of the chorus at full width is spectacular for ambient and post-rock styles. The JC-120 works exceptionally well with bass-heavy chords (open tunings, drop-D) because the solid-state power amp handles the low end with more authority than typical tube amps of similar wattage.
Robert Smith settings: Volume 6/10, Bass 5/10, Middle 5/10, Treble 6/10, Chorus Rate 4/10, Chorus Depth 6/10, Vibrato 0/10. The Cure's Robert Smith built his signature sound entirely around the JC-120 with built-in chorus. Chorus Depth 6 at Rate 4 produces the shimmering, slightly watery tone heard on Disintegration and Boys Don't Cry. Combined with a Roland Space Echo and his Roland GR-300 guitar synth, this is the classic The Cure clean tone.
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