Analogue-sequencer

> Am i right in thinking that the p3 isnt that fussy as to its 
> power supply?

It will take AC or DC between 8 and 12 volts.
I use a 9v AC output regulated transformer rated at 500mA.
I would suggest 500mA as a minimum rating.
 
> Is it that pretty much any old 9v supply is suitable?  I 
> always seem to have a stack of spare novation supplies: 
> theyre 9v dc at 600ma.  Im assuming that one of these would be fine?

That should be fine, yes.
 
> I have no idea if theyre regulated or unregulated, but then 
> the p3s regulator is there anyway, right?

Yep. And there is a diode that either acts as a half-wave rectifier for
AC, or a reverse polarity protector for DC.

Cheers,
Colin f