Unwanted noise

Hi I’m the proud owner of a newly delivered EB. I think I may have a slight problem, sometimes when I select a patch I get an unwanted background noise (usually a whistling sound) I eventually get rid of it after a lot of playing around with the settings but I dont know how I’m doing this, swiching it on or off has no effect. does anyone know whats happening?

Help!!!

Also if I do a factory reset Will I lose all of my 7 banks of presets, the manual says it will restor to Voyager Performer edition programmed by Zon Vern Pyles (my EB is V3.2).

Thanks in anticipation Len.

Is it coming from the backlights?

No I’m aware of that one