Hey Jonathon and Richard,

Just to expand on the doppler stuff: a doppler shift would occur as the
delays are changed at each crosspoint's delayline. So as the source moves
further from a speaker and the delays are updated, the pitch should lower.
Here is a resource you can check out:
https://www.dsprelated.com/freebooks/pasp/Doppler_Simulation.html

You can test this using a sine wave as a source object :)

As far as I know, there are methods that can smoothen the doppler shift (
https://dsp.stackexchange.com/questions/27133/fractional-interpolating-delay-line-still-sounding-glitchy),
or, if the resources are available, you could completely get rid of it by
cross fading between two delay lines.

-- 
Sean Devonport
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