ok - "chmod -x /usr/bin/aplay" solves it. Now that aplay does not run pulseaudio no additional instances is run.
Now the question is why aplay runs pulseaudio.
Lokking the the alsa-repositories I found the following
* alsa-utils - nothing interesting.
* alsa-lib - nothing interesting.
* alsa-plugins - lots of pulseaudio related stuff.
It also turns out that leaving aplay executable and uninstalling libasound2-plugins gives a working system with no duplicate pulseaudio processes.
ok - "chmod -x /usr/bin/aplay" solves it. Now that aplay does not run pulseaudio no additional instances is run.
Now the question is why aplay runs pulseaudio.
Lokking the the alsa-repositories I found the following
* alsa-utils - nothing interesting.
* alsa-lib - nothing interesting.
* alsa-plugins - lots of pulseaudio related stuff.
It also turns out that leaving aplay executable and uninstalling libasound2-plugins gives a working system with no duplicate pulseaudio processes.