IanHaynes wrote: 
> Having looked at some changes I made a couple of days ago, and reversing
> them, it appears to have been caused by setting up CPU isolation in the
> pCP Kernel Tweaks. Having removed this the delay has gone away and is
> back to within a few seconds of FM radio. I don't understand why this
> should affect it but the problem now seems to be solved..

I don't know the Pi hardware but often circuitry has one master clock
and other devices uses this clock  and divide it down according to their
needs. The frequency of this clock can affect what playing rates are
available.  I suspect the tweak may have resulted in a non-strandard
clock frequency which didn't give an accurate clock for 48kHz streams.

Good audio board often have their own crystal & clocking (add costs).  
IIRC The old SB3 player has two crystals: one for 44.1kHz and another
for 48kHz.


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