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To add more confusion. I have an early 90's Taiwan DS-1 and a 2010 Taiwan DS-1.
They sound different for sure, the early 90's sounds so much better you wouldn't think it was the same pedal. I even got to the point where i posted a photograph of the circuit of it on here to see if it had been tampered with (it hadn't).
I've no idea why they sound different but they do. Probably something to do with a different batch of components from a diffferent year that when it's all mixed together in the soup gives a slightly different flavour.
Re the DS1:
The design of the DS-1 has changed little throughout its lifetime but the opamp the circuit is based around has changed several times. From 1978, the DS-1 was using the Toshiba TA7136AP opamp. This remained unchanged for about 16 years but in 1994 it was replaced by the Rohm BA728N. In 2000 the opamp was again changed. This time the Mitsubishi M5223AL was used. The last change came 2006 when the New Japan Radio NJM2904L opamp was introduced.