Ohio Scientific Inc. OSI Superboard II 600 Rev B and C1P 4-bit DAC Sound

Breakout with Simple Sound effects
SUPERBOARD II REV B 4-bit DAC
Translated from German to English
Claudio's web site
Original source code: www.claudio.ch...
I was wondering if anyone else has any examples of the 4-bit DAC sound for the OSI SuperBoard II Rev B?

[@TimothyMusson]

My grandfather added a DAC to his C1P, probably using the same modification. I've got most of his program tapes, and IIRC they include a program that plays the Stenka Razin melody. There's a chance I've already rescued it, but can't remember off-hand. I'll get back to you :)