Hi All. i have 2 WM 507 wireless walkman and both have the same problem. The audio is reduced to a loud buzzing sound almost like intereference from the motor and it obliterates any other sound from the units. i have solved most problems with these units and have the 75mhz receiver headphones working but this annoying audio problem on both sounds like a generic fault. i replaced the caps. on one of the main boards and it made difference. Hoping a member or two may know something about the WM 507 i dont know,

Cheers