Another being creating a delay/echo effect by playing the same thing on another channel but quieter and at a certain time delay (as well as sometimes at a different pan position, or sometimes even with a slight pitch shift ala the detune effect).
One of these being creating a detune effect simply by playing the same thing on two separate channels, but with one shifted slightly in pitch. I've studied several late 80's to mid 90's game soundtracks and found a few techniques they use that I'd like to try to mimic.
However only recently have I started to get serious with it, in preparation for a potential game soundtrack. I've been playing with computer music production in various forms for several years, and have used ModPlug Tracker on and off fro a long time.