jbrels

Hi Guys, I seem to be having a high pitched feedback type sound from my rig when playing live. Im wondering if it is anything to do with my board... I am using a T-Rex Fueltank Chameleon and my pedals go as so; Line 6 G50 Wireless Receiver > Tc Electronics Polytune 2 > Origin Effects Cali76 Compressor > Darkglass B7K > Mxr Smart Gate > Orange Terror Bass (500watt) If anyone has any suggestions they would be very welcome, Thank you. [attachment=193349:pedalboardissue.jpg]