OK - looks like the trouble I was having was due to using the m_audio-audiophile-2496.conf file (which was extracted from pulseaudio-add-profile-sets-for-M_Audio-Audiophile-2496.patch from pulseaudio ticket #624 attachments) thinking it would be a better match for my card than the more generic via-ice1712.conf
Once I'd put everything back to normal, #52 and #57 worked for me.
OK - looks like the trouble I was having was due to using the m_audio- audiophile- 2496.conf file (which was extracted from pulseaudio- add-profile- sets-for- M_Audio- Audiophile- 2496.patch from pulseaudio ticket #624 attachments) thinking it would be a better match for my card than the more generic via-ice1712.conf
Once I'd put everything back to normal, #52 and #57 worked for me.