Need 4 modes with just 3 switches - need all modes to be selectable QUICKLY!

[HankMcSpank]

And - yes - I know Mike will yell at me for suggestiing this, but I normally wait for the pin to return to the un-pressed state in my interrupt handler, then exit & clear the interrupt flag bit. It's just so much easier than sampling pins for a switch-press in a timer-based interrupt. But - Mike does have some cool stuff to do this if you're interested.
!

Great explanation, just one thing...

[noob alert]

Could you please give me an example of some code to implement the bolded bit above? (particularly the exiting sequence & clearing the interupt flag - can't say I've had to do that before)

[/noob alert]

Also, forgive me for asking - but have you a link to Mike's info that you referred to?

Edit: remainder of post deleted cos I spotted a mistake & sorted it!