I have an issue with noise when I use my synth[motif attached to my laptop using usb connection]. It's an issue with the noise that comes from the power supply, if I remove the power supply from laptop and run it on battries, the noise is gone. Till now, I've never used motif enough to care about the noise problem as I would run my laptop on battries when rendering. But now I need to use it extensively and cant take this noise any more. What are your suggestions to get rid of this noise. I need to sort this issue urgently.