OK, rHarv! That helps a lot. Yes, my Edirol SD-80 is a hardware synth, and I don't mind mixing a hardware synth along with the RT's. And now that you mention it, my "noise" is probably coming from my powered speakers and is most likely NOT on my tracks. These "power supplies" for the compact speakers today are maybe NOT filtered as well as they should be. My noise evokes a low "B" musical note, a dead giveaway of an alternating current problem! Ya got me thinking . . . JZ


Having fun!