Changing volume up/down step

Hi !
It there a way to change the step or "holding key repeat speed" of the volume control ?
I am talking about Mk1

I did this with Hi-jack on my Mk2 using ir-translate.Dont know if its true for Mk1. Check out this thread. http://empeg.comms.net/php/showflat.php?Cat=&Board=empeg_general&Number=110524&page=&view=&sb=&o=&vc=1