EXPRESSION and/OR Soundkeys

hi all.
I got my footage it is a image sequence of 60 images of a man walking in the street.
I got my music. i use soundkey to extract the rythm.

what I want to do this :
image 1 ot the man - 2sec (STILL FRAME)
image 2 - pitch point - my sequence image goes to image 2
image 3- 5 sec (still FRAME)
image 4 - pitch point - my sequence goes to image 4.

Basicaly, I want a way to control automatically the changes of images link to the music.
I would decides which key frame would be used to change images.
How can I do that?