Dr_Ugi:
Thank you - that's extremely helpful.
It sure is. Thankyou.
Can you just clear up for me the role of PB3 with PWM? It's marked as OC1B with a line over it, in the same way that PB0 is OC1A with a line above it. Is it that the hardware is capable but we can't drive it with hardware PWM using the Arduino core resulting in what we saw in earlier tests when we tried to analogWrite to it?
Thanks, Geoff