On Thursday 07 April 2011 00:34:03 Dave Phillips wrote: > Greetings, > > I've been working with Ardour3 on my laptop, a machine with an AMD > Turion X2 CPU and an nVidia 8200M integrated video chipset. Recently I > started monitoring my test recordings through the headphone output of my > UA25 and I notice that when I move the mouse it creates scratchy sounds, > though QJackCtl reports no xruns and my recordings are unaffected. I > verified the problem with Ardour2 and Mixbus. It doesn't occur when I > use the integrate audio chipset (snd-hda-intel, wahoo). This is clearly an analogue problem. As both the mouse and the ua25 share the same power and earth and don't provide any sophisticated main-filtering or shielding, you are bound to get such problems. Probably the noise doesn't occure when you use the touchpad. Does the ua25 come with a power-adaptor? Could be that removes the noise. Another more hackish thing to try is to make an extra usb-cable where the data-lines go through but Vcc and maybe even GND are disconnected and the power is feed from an external source. Have fun, Arnold
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