Using cakewalk. Take a kar file. Change the extension to .mid . 

Load the file into cakewalk and do your editing. you can even 
edit the lyrics. if you play around with the numbers you'll 
eventually know which banks to use for differnts drum kits 
and the like. transpose, change volume, velocity, whatever 
you want. save the file. at that point you can save it to 3.5 
and play or load it to the hard drive, if your i30 has one. If 
your i30 and is interfaced with the computer you can play it 
back using cakewalk as the controller. If you want to play it 
back with lyrics on a kar reader on your computer rechange 
the .mid back to .kar. the computer kar reader will treat it like 
normal. this work on most files. sometimes i'll get certain ones 
that have coding that prevent this. but, it's rare. but you 
to do this in the computer. the i30 will do as you said an 
eliminate the lyric track. 
i've done hundreds for my self and my friend who doesn't 
have a computer.
have fun
SideCar Charlie