I’d recommend you add audio_pwm_mode=2 only.
This is a recent addition, AQ on analog out is truly good with this new driver.
It supports concurrent access, ie 2 (or more) separate programs outputting at the same time.
I’m not sure it is out of beta yet? For me, playing audio only with ALSA works a treat.
EDIT: As offered by jdb in his thread, I would recommend using SKIP_KERNEL=1 rpi-update if you don’t want to upgrade your kernel at the same time. I’ve used recent firmware with an older kernel (on piCore OS) and it just worked fine.
"S'il n'y a pas de solution, c'est qu'il n'y a pas de problème." Les Shadoks, J. Rouxel