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To get sound running on Mer requires the pulseaudio code to be developed and setup properly.

In the meantime you can use ALSA with certain apps but you need the Nokia osso-dsp-rx-44-modules

 echo "deb ./" > /etc/apt/sources.list.d/temp_updates.list
 apt-get update
 apt-get install alsa-base tablet-sound
 rm /etc/apt/sources.list.d/temp_updates.list
 apt-get update

The tablet needs to be halted:

 sudo shutdown -h now

and -then- booted, to allow the modules to load, then use alsa mixer to unmute the required channels:

 alsamixer -c 0

On the N800, you need to unmute the PCM channel only, on the N810 you need both PCM and Line channels. To unmute a channel, select it using the d-pad left-right and hit the "m" button on the keyboard. The selected channel should now appear in green colour. Sound level is adjusted using the d-pad up-down buttons. Hit "Esc" on the onscreen keyboard to exit alsamixer.