Re: syngen, audio game and synthesis library for the web
Most of my knowledge is self-taught and practical, so possibly you know more of the DSP math than I do. But if you want a good starting point that may or may not be a quick improvement, you might port my ITD computations, which will require a clockwise angle in degrees from the front of the head (yes, I know, it's a weird coordinate system. But that's what all the HRTF literature does). In terms of pieces you can drop in to WebAudio, that's probably a pretty simple one. That said, I don't promise that all the geometry is right, just that it sounds good when I and some others test it.
You probably just flat out can't get better than a lowpass in WebAudio though. The specification is fine as regards panning. It's not fine as regards everything else. And it's not fine in the sense that all the implementors do a really bad job with it, which really surprises me given how relatively simple audio is as compared to things like WebGl. In this case, Webasm might save you, but the performance of getting audio into and out of it might not be so great. The last time I got as far as wanting to use Webasm for custom nodes, I got tired of just fighting WebAudio nonstop, realized that everything I might ever want to do needs a desktop app because most blind people can't download 100MB of sounds every time they started my game, and went and started Synthizer instead. There's more justification to it than that, namely that we really need an audio library like it that's not thousands of dollars, so it wasn't just me ragequitting WebAudio or anything. But nonetheless here we are.
In either case, if it's helpful in some fashion, my scripts for HRTF impulse normalization are here. They're not perfect, in particular they take out too much of the frequency dependent effects, but I'll be improving them and they're like 90% of the way there.
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