marakanetz...Perhaps RS parts are not of the quality one likes to have in the audio path, but, as a temporary device to determine needed attenuation a RS pot is fine. (And I have never had unusual problems with noise from RS pots, although all pots eventually get noisy and need a dose of contact cleaner..RS again). When the desired pot setting is determined, measure the resistance setting, and replace the pot with a couple of fixed resistors. Surely one wouldn't leave any extra adjustable attenuator device, Mouser or otherwise, in the circuit permanently.