how to set ipo interpolation to all the curves

I’m wondering if there is a way to set the curve interpolation to constant and back to bezier to ALL the curves at the same time, without having to select them one by one,
to make a blocking animation and then polishing it up

OOh never mind!
I found how to do that by selecting all the curves pressing A on the action editor and changing the interpolation mode from there

It’s still not a very good way to do it. Especially if you have a lot of bones on a character you want to change all at one time.

Huh? thats how I do it. What’s a better way?