around 2 months ago, i bought my drum machine; alesis sr18. its great but lately i have been hearing a weird hissing noise out of the left 1/4" output. so i tried many different cords, and i think that the output is screwed up. except.. the noise is only audible when i run it through my mbox to pro tools. otherwise, im not even sure if its there :S has anyone heard a noise like this? the MP3 is on my profile