That scheme of controlling amplitude with two DACs is crazy and wild. He should use some off-the-shelf VCA chip and problem would be solved.
Other than that Qweremin actually makes a lot of sense from musical POV (expressive somewhat synths are rare and expensive) and that rendition of Ave Maria is beautiful. I can definitely see something similar as serious instrument in the future.
I had most success with DeltaCAD. Unfortunately it's only for windows and now also discontinued.
I also like CadZinho (https://github.com/zecruel/CadZinho) but it's missing some features (chamfers and fillets) and it's not that easy to draw precisely sized lines in it.
Rendering of Vector Tiles is not that hard as all the geometry is already processed, polygons assembled and data sorted. If you have good source of vector tiles renderer itself can be relatively dumb.
I was able to implement relatively straightforward renderer in Nim language[0].
I have encountered only three hard parts:
- rendering map labels on paths (this is really hard!)
- how to render labels not to be clipped by tile boundary (I had some ideas but did not implemented it yet)
- collisions between labels and symbols
Other than that Qweremin actually makes a lot of sense from musical POV (expressive somewhat synths are rare and expensive) and that rendition of Ave Maria is beautiful. I can definitely see something similar as serious instrument in the future.