Hi I'm new to TalkBass.com. I recently decided to add some more pedals into my pedalboard as it gives me a wider range of options, but whenever I plug in I get a high frequency signal coming out of my amp like a siren. At first I thought it may have been power so I used batteries for each pedal. It wasn't solved. I then thought it might have been not enough power. Long story short I still haven't been able to fix the problem. I have also taken out pedals and seen if that makes a difference (it doesn't). Having more than 3 pedals makes the noise returns. Can anyone help?????