SF340 CREW SELECTS INCORRECT FREQ FOR ARTCC.

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WE WERE INBOUND TO THE DFW ARPT AT 11000 FT ON THE UKW ARR AND OUTSIDE OF UKW VOR. WE HAD BEEN GIVEN A FREQ CHANGE FROM WHATEVER CTR FREQ WE HAD BEEN ON TO 127.95. I WAS PF; SO THE FO ACKNOWLEDGED; SWITCHED OVER; AND CHKED IN ON THE NEW FREQ. WE HAD A NEW FLT ATTENDANT ON BOARD; WHO AT THIS TIME WAS IN THE COCKPIT ASKING A BUNCH OF TYPICAL; NEW KID ON THE BLOCK QUESTIONS; SO MY ATTN WAS DIVIDED BY MY FLYING; LISTENING TO THE RADIO; AND LISTENING TO THE FLT ATTENDANT. SOME TIME PASSED. WE WERE NOW VERY NEAR TO XING UKW VOR; AND I WAS THINKING HOW UNUSUAL IT WAS THAT WE WERE STILL AT 11000 FT. USUALLY WE WOULD BE DSNDING TO 7000 FT BY NOW. ABOUT THAT TIME I HEARD A CALL ON THE COMPANY FREQ (THE #2 RADIO); AND WHEN I ANSWERED; THEY SAID ATC WAS NEEDING TO TALK TO US ON 127.95. I LOOKED AT THE #1 RADIO; AND IT WAS ON 127.925. WE SWITCHED OVER AND CTR DSNDED US; STARTED TO GIVE US A VECTOR; THEN STOPPED; THEN SHORTLY CAME BACK AND GAVE US A VECTOR OFF THE STAR; AND SHORTLY THEREAFTER BACK ON. I DON'T KNOW IF WE CAUSED A CONFLICT. I HOPE NOT. CTR NEVER SAID ANYTHING ABOUT IT; AND THERE WAS NOTHING ON THE TCASII. AS TO WHAT CAUSED THIS; I'D SURE LIKE TO SAY THE RADIO MUST HAVE GLITCHED AND JUMPED OFF FREQ; AND WHILE I IMAGINE THERE IS A REMOTE POSSIBILITY THAT THIS COULD SOMEHOW HAPPEN; WHAT OBVIOUSLY HAPPENED IS THAT WHEN THE FO SWITCHED OVER; HE MISSED THE RIGHT FREQ BY 1 CLICK; AND WHEN HE CHKED IN; NEITHER HE NOR I TOOK NOTE OF THE FACT THAT THERE WAS NO ANSWER. CLRLY THE FLT ATTENDANT IN THE COCKPIT WAS AN ADDED DISTR. OF COURSE; I COULD ALWAYS STOP ALLOWING THE FLT ATTENDANTS TO COME UP; BUT I BELIEVE THAT THEY DESERVE TO SEE A LITTLE OF WHAT GOES ON UP FRONT; AND IN FACT THERE IS A NEED FOR THAT. BESIDES; WE WERE NOT BELOW STERILE ALT YET; BUT CLRLY I'LL HAVE TO BE MORE CAREFUL ABOUT SUCH THINGS IN THE FUTURE AND DIVIDE MY ATTN MORE APPROPRIATELY.