Hi. I want to control volume of my home made amp(2x100W). How can I do this with Arduino Mega? I want to add an LCD with IR Remote. I have already made a program to control an LCD and to change brightness of display, to change contrast and to change volume. I can also change input and output with my program. Here are sources if you want to do same thing 
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Main code: http://dl.dropbox.com/u/66389935/IRRemote_arduinoMega.ino
Functions file: http://dl.dropbox.com/u/66389935/functions.ino
LCD code: http://dl.dropbox.com/u/66389935/lcd.ino
(you must download all files to make it work)
Thank you for your help. I hope you enjoy my code!