Hi Rod,
I don't think that you can do that. If you mean can you adjust the treble and bass levels during playback, then yes this is possible if you have an equalizer installed. If playing through
Windows Media Player, then this is accessible by right-clicking on the screen, mousing to
Enhancements over the popup menu that appears and then clicking
Graphic Equalizer.
For example, this shows a still from the film
Kind Hearts and Coronets with the equalizer showing.
An alternative way, and one that can also enhance the method I described above, is to adjust the equalizer settings through your audio
driver interface (if it supports this feature).