STS has been quick to update his Audulus clone of the Turing Machine – now also a Mk.II. He pinpointed the cause of the audio rate clocking problems that I’d run into and took the opportunity to redesign the shift register (which now uses 30–40% less CPU cycles than before) as well as implement some other improvements.
I’ve played around a bit with the audio rate clocking – specifically trying out waveshaping with the volts expander and changing the pulse width on the pulse out, as in the last section of the MTM video. It seems to be working very nicely.
I’ve posted the patch on the Audulus forum.