Odd noise during/after notes

[jfbauer432]

I gave this a try but I am getting some odd noises. Seems to be some combination of a hum and a swishing sound. Seems to happen with/after the notes. Here is a sample of what I am getting

:o=4,b=115:4e,2e,2p,4e,2e,2p,4e,2e,2p
Recording https://easyupload.io/76uxom

The issue is more obvious during the brief rests. If I add additional rests I can clearly hear nothing during that time as expected.

I am using the circuit from the README.md with a LM386 based amplifier (https://www.amazon.com/gp/product/B01FDD3FYQ) and an Arduino Uno.

[nathanRamaNoodles]

Try changing the frequency of the timer:

synthEngine mixer(20E3);

Instead of 20E3, use 30E3.
If that doesn't work, try changing the octave level from o=4 to o=5

[jfbauer432]

I was using v3.5.2, but that didn't appear to have the synthEngine stuff. I deleted the old library and installed the latest zip (4.0.0). Tried both synthEngine mixer(20E3) and synthEngine mixer(30E3) and I did not hear any difference.

Changing the octave made the notes sound different of course, but I still here that noise -- the pitch of the noise seems to have gone up as well. Also tried o=6 and it was still present.