Multisamples and eb16...

I'm quite new to the mpc, only had it for a few weeks. I'm about to buy the effect board and I'm wondering about multisamples and how it works with adding effects. Can I add lets say reverb or eq to a whole program or track, or do I have to add it to every channel in the mixer for that program?

yes you add the fx to the channels in the mixer for every channel of the program.

hmm ok, is it possible to select all channels and add effects to the 16 channels at once? otherwise it will be a pain in the ass to add fx to multisamples with the eb16....

It's possible the same way as you adjust volume or pan in mixer.