Missing audio on H264 videos & Mythtv.

Recently I did a reinstall of my Mythtv frontend. Everything seemed ok apart from the lack of audio on
H.264 video clips which are taken with our Creative Vado HD camera.
This was working before the install so I'm not sure what I changed.
Anyway I posted a query on the mythtv-users list and a kind person called David Linville replied they had a similar problem which was fixed my changing the audio output device from ALSA:hdmi to something else.

After I had enabled all the ALSA devices in 'alsamixer', see first screenshot, I managed to get the audio working again! I took a quick photo of the settings for future reference and just in case it helps anybody else.
I'm using an Acer Revo 3610 for the frontend with Mythbuntu 9.10.