Thanks Doug,
I'm not making the board but using this one which has a volume control on it:
With regard to the "pop" the datasheet goes on to say,
The impedance seen at the inputs should be limited to an RC time constant of 1 ms or less if possible. This is to
allow the input dc blocking capacitors to become completely charged during the 10 ms power-up time. If the input
capacitors are not allowed to completely charge, there will be some additional sensitivity to component matching
which can result in pop if the input components are not well matched.
Does this suggest lower value (0.1 uF?) capacitors should be used on the input?