SD-2 Dual Overdrive

The SD-2 contains two independent overdrive circuits providing two different modes of operation. The LEAD mode produces a thick, smooth sound while the CRUNCH mode produces a fat, crunchy sound. There’s also a LEAD/CRUNCH mode where you can alternate between the two modes each time you step on the pedal. The pedal uses concentric potentiometers for Level, Tone and Drive so it’s possible to keep completely separate settings each mode. When in CRUNCH mode, a latching foot switch can be connected to the remote input. This foot switch will then switch between LEAD and CRUNCH mode while the main pedal switch will turn the effect on or off.

Features
Independent over drive circuits for LEAD and CRUNCH
Both overdrive circuits in the SD-2 are using LEDs as clipping diodes.
Two colour LED (Red for LEAD, green for CRUNCH) indicates operation mode
Connection for optional footswitch like the FS-5L

Specifications
Controls: Level, Tone, Drive, 3-way Mode switch
Connectors: Input, Remote, Output, AC Adaptor
Current Draw: 21 mA (DC 9V)
Recommended AC Adaptor: PSA Series

Labels
Silver – Made In Taiwan
The SD-2 was sold from April 1993 to December 1998.

http://bossarea.com/boss-sd-2-dual-overdrive/