audio-speaker
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Audioworklet
https://github.com/geekuillaume/node-audioworklet Maybe use as alternative node backend? Factors: delay, available formats, easiness of install.
Looks promising!
available formats
It looks like we can get the device's available formats. If floats aren't supported, then I guess a hard error is okay to start, then maybe reformat the data (any gotchas? latency converting the floats to integers?)