Hi to everyone! I'm getting a bit annoyed by the constant presence of a low high-piched noise every time I plug an instrument to my M-audio fast track mkII. every time I playback audio or use Sonar 8.3.1 to record, I hear this noise which would be bearable if only it DIDN'T get INTO the recordings! I'm running Sonar in Windows 7 ultimate 64 bits, and I should stress that this DOESN'T happen with an HP notebook running the same Sonar but under Win 7 32 BITS. I kwow this may sound strange, and at first I thought it was related to the RCA outputs going to the monitors/speakers, but after testing all the different USB ports and getting a reinforced/isolated RCA cable, the noise is still there every time I try to "listen" to the instruments coming into the INPUTS in the Fast Track. Any ideas? what should I do to stop this? computer specs: AMD Phenom x6 8gb ram HD 500gb Asus mobo I'm desperate!! can anyone help!!??