I don't know if this will help anyone else arrive at a solution, but I observed 
alsamixer while switching back and forth between non-speaker phone mode and 
speaker phone mode in a phone call. While switching the mode I watched capture 
"devices" (not sure of the correct term) DEC4 and DEC6 change gain amounts as 
follows:
        
non-speaker phone mode
DEC4 at 68%, dB gain: 0.84      
DEC6 at 80%, dB gain: 0.99

speaker phone mode
DEC4 at 70%, dB gain: 0.87
DEC6 at 68%, dB gain: 0.84

I'm learning about this on the fly because I'd like a solution, so I
have no idea what to do next but maybe someone else does.

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https://bugs.launchpad.net/bugs/1318360

Title:
  Poor microphone quality (mako)

Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  After months of complaints from people talking to me on the phone
  (mako ubuntu touch), I finally got around to use multiROM to dual boot
  Ubuntu Touch and Android. Several people can confirm that there is a
  noticable difference in terms of sound/microphone quality between
  Android and UT in phone calls. With UT, my voice gets distorted to an
  extent that person at the other end have real difficulties to hear
  what I am saying, while with Android call quality is much better with
  no distortion.

  I have had a suspicion for a long time that this might be a software
  and not a hardware issue. After trying Android and Ubuntu on the same
  hardware I believe this suspicion is proved correct. This issue has
  persisted in all the builds I have tried since at least the beginning
  of the year, but probably longer. I am now at r17 of Utopic.

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