Noises and beeps...

Hello,
I have organised another party with my best friend. I wanted to play with Cross for the first time and so I tested it on early saturday morning. There were noises and deeps on the PA system. First I thought of the ground loop problem and unplugged the power adapter without any result. Using the laptop's touchpad caused a frequency modulation of the noise. Every turn on the pad was hearable - I wanted to laugh, but I could not. Fortunately I burn all the tracks as audio CDs although I am using Cross, so I could play the gig without any problem. But it would be nice to use Cross at forthcoming gigs.
So here I am with my problem, anyone in here with a hint? I guess that it is hardware related. Did anybody recognize something smiliar?
Greetings,
Steve
I have organised another party with my best friend. I wanted to play with Cross for the first time and so I tested it on early saturday morning. There were noises and deeps on the PA system. First I thought of the ground loop problem and unplugged the power adapter without any result. Using the laptop's touchpad caused a frequency modulation of the noise. Every turn on the pad was hearable - I wanted to laugh, but I could not. Fortunately I burn all the tracks as audio CDs although I am using Cross, so I could play the gig without any problem. But it would be nice to use Cross at forthcoming gigs.
So here I am with my problem, anyone in here with a hint? I guess that it is hardware related. Did anybody recognize something smiliar?
Greetings,
Steve