So, you don't use it in the right way :).
First
66-enable(src/lib66/parser_utils.c: keep_common: 570): warning: unable to use the service -- permission denied
you try to enable the service with root privileges where the service is made for a regular user.
If you look at the frontend file you will see: @ user = ( user ). If you try to use as root, 66 will not accept it :).
Second.
To be able to use it properly you need to set and start an user supervision tree. To do it you need to follow
https://wiki.obarun.org/doku.php?id=dbus_and_dm (only the first part concerning the module activation). I don't know how you start your X session but be aware about the change inside the .xinitrc. Your original one will be renamed .xinitrc.back.
This module will set and bring up an user supervision tree at boot time.So, after the activation of the module as describe in the wiki, reboot or start all services inside the tree by .eg (as root)
# 66-all -t boot-user up
Now you will be able to start a service at regular user. The first thing to do is to create a tree as regular user like this
% 66-tree -ncE <mytree>
Replace <mytree> by the name of your choice.
Then you will be able to active pulseaudio on that tree as regular user:
% 66-enable pulseaudio