[sdiy] Harmonic content of the "sigmoid" half-sine wave

[David G. Dixon]

OK!  I'm going to cut the damn jumper on one of my VCOs which hardwires the
triangle to the sine shaper and put in a switch to select triangle or saw
(or just take the output from the centre-vs-edge PWM type switch I've
already got on there) tonight.  Then we can see what this dumb thing really
sounds like, and whether it's worth all the fuss!