Electronic music and sound design (vol.1) page 195 activity

Hi everyone, total noob trying to learn the basics of max/msp with this book and while I learn a lot of things with it, I sometimes struggle with some of the activity at the end of the chapters. This one in particular is giving me headaches so I'll recap : I need to replace the "monosynth" subpatch of an existing patch. I must substitute the "monosynth" subpatch with a sfplay~ object. There's a subpatch called "drunk between" in the original patch, this subpatch is generating a random walk between two values, in the new patch this subpatch must generate random multiplication factors between two values (if I understand correctly) so I guess I have to take the final value and then pass it to a * object (how to do that ?) that will then alter the rate at which sound samples are read by the sfplay~object via a prepend object using the word "speed" as its argument. At this point I'm totally lost and banging my head against the wall, this is very frustrating, any help would be appreciated...