Comparing Parametrically Modulated Regressors to one another

Hi, I have a question about parametric modulators. Is it possible to compare two parametric modulators for a same onset in fMRI? For instance, if, at onset, I model the signal with 3 values (pitch, volume and location) of a sound, can I create a test where I compare parametrically modulated pitch vs parametrically modulated volume at the group level?
Thank you.
Bear Brain