The PastFX OG-1 Super/OverDrive is a limited-run overdrive pedal that puts two classic Boss circuits in one box: the early Boss OD-1 and the Boss SD-1 Super Overdrive. PastFX describes it as "a PastFx limited run of the 3403 early version OD-1 with bonus SD-1 addition"1. Its centerpiece is the JRC3403 14-pin op-amp, the same chip Boss used in the original OD-1, a part Guitar Pedal X calls "next to uobtanium now"2.
The OG-1 Super/OverDrive is a limited pedal from PastFX that combines the circuits of two Boss overdrives, the OD-1 and the SD-1, in one unit1. Its list price is listed as $POA1.
OD-1 and SD-1 voicings in one overdrive
The Boss OD-1, released in 1977, is the pedal that invented the overdrive category in stompbox effects. Boss describes it as having "an asymmetrical clipping circuit that reproduces the pleasing sound of a driven tube amp," producing "warm, fat tones rich with even-order harmonics"34. Aion FX calls it "a precursor to the Tube Screamer"5. The early units were built around a 14-pin op-amp, the RC3403; TONEHOME notes that later OD-1 versions replaced "the fantastic sounding 14 pin op-amp RC3403 with a dual op-amps (e.g. JRC4558DD)"6.
The SD-1 then expanded on the OD-1 design. Boss says the SD-1 "expanding on the OD-1 design with enhanced voicing and a tone control"7, and Rod Brakes writes on boss.info that it is "built on the tonal foundation of the legendary OD-1, it offers the same warm push and smooth asymmetric clipping"8. Guitar World's review lists its controls as "Level, Tone, and Drive"9.
The OG-1 gives you both circuits. Guitar Pedal X describes it as combining "OD-1 and SD-1 modes with a rare JRC3403 14-pin OpAmp, clipping, Presence, Tone and bass options"2. A mode switch selects OD or SD voicing, and the Tone control is only active in SD mode, matching how the original OD-1 shipped without one1.
The controls
Guitar Pedal X lists the full control set2, and PastFX's product page details the switching options1:
| Control | What it does |
|---|---|
| Level | Sets output volume2 |
| Mode | Selects OD-1 or SD-1 voicing2 |
| Gain | Sets the amount of drive2 |
| Presence | Pushbutton; press in for additional high frequencies, stock when out12 |
| Tone | Tone control, active only in SD mode12 |
| Clipping | Asymmetrical, or symmetrical when the SYM pushbutton is pressed12 |
| Bass | 3-way switch: middle is stock, up is bass boost, down is bass cut12 |
There is also an internal LED brightness control for the footswitch indicator1.
The clipping switch is the deep-cut feature for players comparing circuits. The original OD-1 and SD-1 both use asymmetrical clipping, which produces the even-order harmonics Boss describes38. Pressing the SYM pushbutton switches the OG-1 to symmetrical clipping, a different clipping character many players associate with smoother, more compressed drive1.
A limited run based on the early OD-1
The OG-1 is specifically a recreation of the 3403 early version OD-1, the version with the 14-pin chip that later Boss units dropped16. PastFX built it as a limited run rather than a standard catalog product, using the vintage JRC3403 op-amp that makes the early OD-1 units collectible12.
The OG-1 is a limited edition, not a standard production pedal. It was originally offered largely by invitation, and PastFX later opened direct purchase to USA customers for a short time, with tariffs covered by PastFX12.
Guitar Pedal X reported in March 2026 that "the OG-1 and Retiklon are largely on invitation only, while a tiny number may eventually appear on the All Things String" Reverb.com store2. By July 2026 the same site noted "you can also now get the OG-1 too (OD-1 + SD-1)"10. The list price was given as $POA, price on application, in March 20262.
Among the reviewer's impressions, Guitar Pedal X's Stefan Karlsson wrote:
"my favourite voicing turns out to be the SD-1 one - mostly with stock settings!"
Guitar Pedal X, March 20262
Videos
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Questions
What chip does the PastFX OG-1 use?
It uses the JRC3403 14-pin op-amp, the same chip as the original Boss OD-1. Guitar Pedal X notes that this part is nearly unobtainium today. Later Boss OD-1 versions replaced the 14-pin RC3403 with a dual op-amp such as the JRC4558DD, which is part of why the early units are sought after.
How much current does the PastFX OG-1 draw?
According to PastFX, it draws approximately 10mA in OD mode and approximately 80mA in SD mode. It runs on 9V DC through a 2.1mm Boss-style negative tip jack, so it fits a standard pedalboard power supply.
Can I buy the PastFX OG-1?
It is a limited run that was originally made largely by invitation for PastFX's close customers. PastFX later opened direct purchase to USA customers for a short time, with tariffs covered by PastFX. The list price was listed as $POA (price on application) in March 2026.
What does the Presence switch do on the OG-1?
The Presence pushbutton switch adds additional high frequencies when pressed in. In its stock position it leaves the voicing unchanged, matching the original circuit.
What is the difference between the OD-1 and SD-1 modes?
OD mode reproduces the early OD-1 circuit, which has no tone control. SD mode adds the SD-1's tone control, which is only active in SD mode. The two modes also draw different current, about 10mA in OD mode versus about 80mA in SD mode.
Sources (10)
- OG-1 Overdrive, PastFx, 2026
- Guitar Pedal X, Guitar Pedal X, 2026-03-04
- BOSS - PX-1 | Plugout FX, BOSS (boss.info)
- Guitar Pedal X, Guitar Pedal X, 2025-08-28
- Parhelion Vintage Overdrive / BOSS® OD-1 Overdrive, Aion FX, 2021-03-19
- TONEHOME, TONEHOME
- BOSS - PX-1 | Plugout FX, BOSS (boss.info)
- The PX-1 Plugout FX: Timeless BOSS Pedals Reborn, articles.boss.info, 2025-06-06
- Boss SD-1 Super Overdrive review, Guitar World, 2026-08-17
- Guitar Pedal X, Guitar Pedal X, 2026-07-24
