Hi, with ardour you will need to select the audio outup path, (to HW:0, or your sound chip name)
Ardour requires memory settings in /etc/sysctl.conf
fs.inotify.max_user_watches = 524288
and if you are dealing with RealTime you may need jack(seq) and set-rlimits.
First make sure you (and your users) are part of the audio group.
You may need to reboot for the permissions to take effect.
Next makesure you select the correct audio out.
Hope this helps.