https://source.android.com/docs/core/audio/combined-audio-routing
This looks promising. I was planning on adding a “sensory substitution” trainer feature to ZINC where you can sense voice or music or some other data and train your brain to interpret it.
If possible it will have a toggle for playing it on speaker simultaneously.
I also want to try something: remap the 0-20000Hz of an audio signal to 0-500z to hopefully compress all the information into the sensing range. Hopefully in realtime with FFTs and stuff.
Or at least bring down the higher frequencies a bit, maybe not the full spectrum.
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