I've got a hand-me-down Panasonic Model KX-TCM937-B 900 MHz Cordless
phone/answering machine combo.

I'm trying to figure out how to turn off the loudspeaker for incoming
messages.

I was able to find the manual online at:

http://www.panasonic-kx.com/USER_MANUAL.htm

On page 29, under "Monitoring incoming calls," the manual tells me:
"While a call is being recorded, you can monitor it through the
speaker." But It neglects to tell me how to turn off the speaker
should I not want to monitor incoming calls. Like when I'm trying to
take a nap (!)

Anyone know how to do this?

Will in Seattle
a.k.a. "Clueless"