Hi Art,

In what part of the "Land Down-Under" do you reside?
I am in Sydney's southern suburbs.

Thanks for the quick reply.
Noise detection systems are overkill for this project. I was hoping that the power up sequence for individual devices would have provided some degree of variation.
What if I used a timer based system to generate the seed and then de-tuned the internal oscillator between various devices to get some spread of variation - do you think that would work?
Alternately, I could cascade a pulse from PIC to PIC and emulate a button push... just thinking out aloud here.

Cheers
Barry
VK2XBP