Actually, take it back. I confused myself because my working code to get around the popping problem actually calls the mixer twice if the tone controls are set - Doh!

However, it looks like it is a race hazard in DC mode when it is not powering up into standby. (ie you didn't put it into standby first.)

Why the player holds off on setting the tone controls for this one case I don't know.

So at the moment:
AC: boot-> standby - player sets eq, then tone controls.
AC: boot-> active - ditto
DC: boot-> standby - ditto
DC: boot-> active - player delays, tone controls set, then player sets eq. Bad.

Ok, a time for a delay loop.