> I guess it does not burst into flames at 7V, but will not work
> there either
> 
> Harold

I realise this is straying into non-[PIC]

The storage array is analogue. If you were to record at 2.7V
and playback at 3.3V ....... ??? Conversely, record with fresh
batteries, does playback change or deteriorate as batteries run
down ?

An exercise I'll try when it's all up and running (at 3V of course)
because I like to know how chips behave, over and above what's
in the datasheet

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