Delving into rack delays...I see that Korg released an SDD-1000, SDD-2000 and SDD-3000. Then, they also have an SDD-1200 and SDD-3300. I'm wondering what the release dates were for each of these (really, which was first, which came later) and differences among them? SDD-3000 (1983) - 1023ms, special preamp, 9 programmable presets SDD-1000 (1984) - 1024ms at full frequency, 2048ms at half frequency - all knobs SDD-2000 (1985) - 1092ms at full frequency, 4368ms at reduced frequency - 64 programmable presets, MIDI, sampling SDD-1200 (DATE?) - 1024ms (doubles when delays in series), dual delay lines SDD-3300 (DATE?) - 500ms per line (triples when delays in series), three delay lines Second Topic: If I buy a separate pedal with the "magical SDD-3000 preamp" in it (looks like a few exist) and put this in front of any of the above, will I miss anything else about the SDD-3000? For example, the SDD-2000 looks like a more feature-heavy delay - will the preamp pedal and the SDD-2000 give me what the 3000 provides in terms of delays? EDIT - The answer, per the posts below, is NO! The 2000 has more differences than just the preamp.