Boss SD-1 Super OverDrive Allédyne Modification

***This post has been revised with updated information as of 11.12.18.***

Allédyne™ is the banner name I put on anything software or hardware I create or modify.  In the beginning, I started throwing this name on modified software synth GUI's and DAW GUI's.  As I began developing hardware mods and adaptions, such as electronic drum trigger systems, partscaster guitars, guitar pedal mods, and audio circuit desgns, I adapted this name to those projects as well. . .

**SEE VIDEO BELOW FOR FULL DEMONSTRATION**

Since 1981, the Boss SD-1 has been found on the pedal boards and recording studio floors of a myriad of performing and recording artists. As Roland® Corporation's answer to the Ibanez® TS-9 "Tube Screamer", this pedal has become a classic in its own right. I first off have to give kudos to the person(s) at Roland who originally designed this pedal; even if they may have referenced the circuit design of the TS-9 for the SD-1 topography. Honestly, many, many pedal companies and boutique builders have copied or mused off the TS-9 circuit. Nevertheless, I, of course, did not design this pedal. While It's been a fun challenge to come up with circuit modifications to the original design that enhance the pedal's capability for differing music genres; it is a different thing all together to create a workable electric circuit from the ground up. If it weren't for the engineer(s) at Roland and other companies, I would not have pedals to create modifications for. 

The Allédyne modification of the Boss® SD-1 Super OverDrive provides the recording guitarist/musician with a single affordable hot-rodded versatile overdrive pedal. With this single pedal, one has the ability to set up a tailored guitar sound for backing/rhythm guitar performance and bed tracking. While this pedal mod can certainly be used stacked with other pedals or alone for soloing, it is clearly designed to stay within the overdrive range. That being said however, turning the knobs up all the way will, without question, rock the house. . . It gets seriously meaty.

Circuit modded features include:

•         More gain 
•         Extended low frequency response 
•         Re-voiced tone control
•         Symmetrical clipping via LEDs and rectifying diodes
•         Asymmetrical clipping via LEDs

Aesthetically modded features include:

•         Super bright pink LED CHECK indicator
•         Level and Drive knobs replaced with clear Davies style
•         Custom waterslide decals

I exclusively use metal film resistors and high-quality capacitors in all pedal discrete component modifications.  In the case of this pedal; Nichicon film capacitors and TDK Class I ceramic capacitors.

​The Allédyne modded SD-1 exhibits a wide ranging capability for crafting
all sorts of tube like “break-up” sounds, from punchy bell like Vox / Fender (Mode II) to warm burning Marshall Plexi (Mode I). . . 

The tone control has been re-voiced to allow the response of the pedal to remain
musical even with the knob opened all the way. No fizzy, thin, or shrill top end.

Two clipping modes work with the Level and Drive settings for honing in on that “just right” sound.

​**This pedal mod has great touch sensitivity and works well for setting up a “dynamic” overdrive effect (Check out segment 12:14 on the Full DEMO video.)**


Mode I: Symmetrical clipping using combination of LEDs and rectifying diodes.
Mode II: Asymmetrical clipping using LEDs.

More available gain with an extended low frequency response helps the pedal push a tube amp’s clean channel into an overdriven state by using the Level knob alone (boost configuration).

Check pedal availability at:

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