Washburn D10BK has a background buzz i can not isolate! Constant

Go into function and look for the volume setting for your main voice - could be R1. This will give a numeric value of 127 or less. It sounds like you need to increase it, try 100 as that is usually sufficient.

You may have damaged the variable resistors (the volume controls), you can purchase replacements from a local Electronics store (if UK based try Tandy). Otherwise have you checked the speaker itself for damage? You may have split the speaker which will need to be replaced.

two of the controls are volume, two are tone, (at least usually). the best way to use the controls is to try one at a time till you find the combination that pleases you most. I have been playing bass for 40 years and have 7 bass guitars, two with active pickups and two that acoustic electric

clean all "vr" (variable resistors) like volume bass treb etc, sounds like bad contacts. this happens due time while they oxidating. maybe helps. use "contact" spray for best result

Try moving your guitar around and oriented differently as it MAY be picking up magnetic fields from equipment in the area. Some pickups really are sentive to interference.

The effects for modeling MAY have a noise gate that requires a certain signal level before unmuting which would explain why you have to be playing to open the gate and hear noise that is really there all teh time but muted.

Almost any guitar store would have this and any Luthier would likely have a replacement.

Washburn is a name brand so it should be easy to find the replacement.

The probable cause is either one end of the volume pot is broken, or the wire to it is broken. Test the control and wiring with an Ohmmeter.

Try this site:

Select the lesson on "Tuning Machines"

This looks like a good resource for information.

Either the pot is wired backwards (easily determined if volume increases in correct direction) OR the pot may be bad. Some defective ones can have a dead spot at the end.

ALSO check for splder splashes casing shorts.

ALSO check that terminals are NOT touching the wood as the BLACK PAINT is conductive and tied to ground.

Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.