Side by side shots of the Korg SD delays, the -200 opened for comparison while I convert the -400 for 240V.
![Korg SD-400 and SD-200 front panels](https://zasm.earth/images/mtech/korgsd/korg_sd400_on_sd200_600.jpg)
The SD-400 (brown) has the bypass, short/long delay option, swell, and ADT settings, but no tone control. I haven’t quite worked out which I prefer; the -400 seems to have a fixed filter; it’s smoother than the SD-200 (silver) on simple delays, unless you turn the -200 tone down. Maybe the -200 is better for harsher delays. The only online technical information I’ve found for them suggests they have roughly the same range of 30–400ms for the -200 and 25–400ms for the -400. Presumably the -400 should go lower on its Short setting, but it’s the same as the -200 on its Long setting. In practice, comparing these two, the -400 gets up to around 10% longer delay, but that could just be a calibration thing on one of them.
![Korg SD 200 and 400 open](https://zasm.earth/images/mtech/korgsd/korg_sd200400_open_400h.jpg)
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