You will obviously need to do something similar to the volboost code and keep tabs on what adjustment you are making at any time, and removing the current adjustment before re-reading the volume (in case the user changed it mid-song) and applying the new one. This keeping tabs is made harder by the fact that any adjustment you make has to be kept within the hard limits of 0 <= adj <= 100. You'll have to detect when this happens and calculate what adjustment you *really* make in order to be able to undo it;

Hmm... The strategy sounds like it would work. I may play around with this some in the coming days and weeks.