The Supro 1310 Harmonic Tremolo is a tremolo effect pedal launched in December 2016. It offers sounds based on the warm, classic tremolo effect players normally associate with a vintage valve amp, and it puts two kinds of tremolo in one box: a switch chooses between Harmonic and Amplitude modes, with each giving a different tremolo sound1. It sits in the wider field of tremolo pedals alongside Supro's later Dual Mode Tremolo and Analog Dual Mode Tremolo.
What it does
Supro describes the pedal's tone with the word "swampy", and gearnews.com's reviewer found that it seemed to suit the sound: warm with a subtle warble, not too choppy, bordering on a very organic amp-like feel1. According to Supro's marketing, the pedal emulates a Class A circuit "from end to end"1.
Controls, modes and expression input
The control layout is simple, comprising Speed, Gain and Depth knobs1:
| Control | What it does |
|---|---|
| Speed | Sets the rate of the tremolo; can also be controlled by an optional external expression pedal1 |
| Gain | Gain control on the pedal's front panel1 |
| Depth | Sets the depth of the tremolo effect1 |
A switch selects between Harmonic and Amplitude modes, each giving a different tremolo sound1. An optional external expression pedal can take over control of the tremolo speed, which is worth planning for on a board that already uses expression pedals1.
Launch and what reviewers said
Supro launched the 1310 Harmonic Tremolo in December 2016, with a UK RRP of £2091. Writing at launch, gearnews.com's reviewer judged it a good-sounding tremolo, judging by the demo video, with classic vintage sounds aimed at players looking for a blues rock overall sound1.
Supro later refreshed and re-styled this design: in January 2024 the company revamped the pedal's styling with a smoother enclosure and milled aluminum knobs, keeping the tone intact and pricing it at $219 from the Supro Webstore. The refreshed pedal appears on the site as the Supro Dual Mode Tremolo.
Videos
Pete Thorn
Supro
PJ and the Beard
Questions
What is the difference between harmonic and amplitude tremolo on the Supro 1310?
The 1310 has a switch that chooses between Harmonic and Amplitude modes, and each gives a different tremolo sound. Amplitude tremolo is the kind of pulsing volume effect players associate with vintage valve amps, while harmonic tremolo works on the tone in a different way. Supro put both in one pedal so a player can pick the character that suits a song or amp setup.
Can I control the Supro 1310 speed with an expression pedal?
Yes. The pedal accepts an optional external expression pedal that can control the speed of the tremolo effect, so you can sweep the rate by foot while playing rather than reaching down to turn the Speed knob.
How much does the Supro 1310 Harmonic Tremolo cost?
At launch in December 2016 the pedal carried a UK RRP of £209. Pricing in the United States was not given in the launch coverage.
Is the Supro 1310 the same as the Supro Dual Mode Tremolo?
The 1310 Harmonic Tremolo is the pedal as launched in 2016. Supro later refreshed and re-styled the pedal as the Dual Mode Amplitude + Harmonic Tremolo in January 2024, with a smoother enclosure and milled aluminium knobs while keeping the tone intact.
Sources (1)
- Supro 1310 Harmonic Tremolo: Swamp Thing?, gearnews.com, 2016-12-06
