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User:RuiSeabra said:
...
That's very interesting, but - as elaborated to Rui in IRC - doesn't mean much as buzz isn't related to using PGA. Rather using PGA "detunes" the overall setup of mic path, by introducing several new parameters (PGA controls in digital domain of mixer), which Rui hasn't looked at, taken into account, or even finally listed all the relevant settings' values here. Furthermore there's nothing (except AGC, which is considered contraproductive for calypso's NR&AEC, and very unlikely Rui had a working setup for AGC by mere incident) you could implement by using a routing via PGA, rather than just adjusting #5 (#48, #12. In that precedence) to compensate for pathgain changes done by PGA.
Finally buzz is basically completely unrelated to PGA (if not any mixer volume settings) at all
2009-12-01 jOERG--Openmoko HW development and synergy
This is not buzz related (my phone has the buzz fix).
With no electricity or sound engineering background, I can't explain this other than in these terms:
There may be better solutions, but while they are not found, can we at least provide a working sound setting?