PM400: Muting The Front Speaker

[W2PAX]

I have a streaming audio feed that I remotely manage that uses a PM400. The local host, even with the minimum volume, wants to mute the front speaker, BUT still turn it on if they want to listen to it. Is there a way to do this through the 16 pin connector? I ask because this feed once employed a GM300 for the same purpose, and this was accomplished by splicing a toggle switch between the internal speaker + and the external speaker +. Worked splendidly. Splicing the toggle between the same function pins on the PM400 doesn't produce the same result.

Any help would be appreciated.

Best regards,
Dave S.
W2PAX
Naples, FL

[ve3nsv]

Make sure you are in expert view in the CPS. Under accessories, check handset. Then the internal speaker will only work when a mic is plugged in and hung on the clip.