[maxmsp] wav file volume control

Hi!

I have a patch set up triggering an audio sample. the sfplay~ object is used to play a wav file. I want to be able to trigger the sample at different volumes depending on incoming acceleration values e.g. greater acceleration would result in a higher volume. 

I'm looking for more of a hint really than just a straight forward answer. I'm not sure how to control the volume from the ezdac~. I tried to use the gain object but this didn't seem to work. I'm sure if I knew how to alter the output volume I would be able to work out the rest!

thanks!