thcopeland

Very cool! Technically this is a reed organ (as noted in the original video), since the sound is produces by a vibrating tongue instead of air resonating along a pipe. The horns on top, which look a bit like pipes, are probably just there to improve the tone a bit.

This reed organ still sounds pretty buzzy, but a full-size one isn't so bad. Rodney Jantzi's website https://www.rodneyjantzi.com features some pretty great recordings, as well as pictures of reed organ restorations. Earlier this evening I finished re-covering the reservoir of a 120-140 year-old reed organ, so reed organs are pretty near to my heart right now.

Dr. Douglas Jones wrote a pretty great article on the subject, https://homepage.cs.uiowa.edu/~jones/bcd/divide.html. Depending on the divisor it can be a bit messy, since reciprocal multiplication sometimes needs extra precision. For example, on an 8-bit machine, x/6 == (x*42>>8), which is nice because 42 fits in 8 bits. But x/105 == (x*313>>15) needs 9 bits to hold 313. On some systems (thinking 8-bit AVR), it'd probably be faster to branch on the 3 cases rather than perform a full 16-bit multiplication.

Thanks very much! I had a Arduino for most of a decade before doing anything with it, must be a trend.