SDD-3KP PRE-AMPLIFIER

The Korg SDD-3000 Digital Delay is an rackmount effects unit made famous by The Edge of U2. For guitarists, this effects unit can be thought of as two effects in one. The first is of course the fantastic-sounding analogue-sounding digital delay with its super-deep modulation. The second is the preamplifier section, which when driving a Vox AC30 or similar amplifier can achieve really nice overdrive tones. Depending on the setting, the preamp’s effect can range from subtle to extreme. I tend to think it sounds best on the subtle side, as an “enhancement” of the Vox tone you already have. Since there are a few nice modulation delays now today (Timefactor, etc.) that can sound similar to the SDD-3000′s delay effect, a useful effect would be one which replicated the preamp section in pedal form. The schematic is easily traceable from the SDD-3000 Service Manual (see pages 7 and 9 of this .pdf).