Echo problems - what's causing them?

A few phones are reported here to have echo problems, in my case the Moto G4 Play (harpia). However, these seem impossible to fix and remain in different versions of /e/.

Are some low-level audio processing functions contained in device-specific drivers? Presumably, /e/ developers will not be able to fix such drivers - e.g. looking at the Lineage build instructions, there seems to be a lot of proprietary stuff:

Maybe someone knowledgeable can shed some light on the problem?

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I will be watching this thread with great interest, Pinback- my Samsung S6 also suffers from this issue.

As do many others