ACR B727 OCCUPIES RWY AND IS IN POS TOO LONG AS FLC HAD INADVERTENTLY SELECTED DEP CTL FREQ ON VHF. 1 ACFT HAD TO PERFORM A MISSED APCH. RPTRS CITE 3 AMENDED CLRNCS RTE CHANGES WHILE TAXIING AS CAUSAL.

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CHANGED RNAV TO ACCOMMODATE RERTE. TAXIED OUT FOR TKOF. JUST PRIOR TO TAKING RWY FOR TKOF; GND ADVISED ATC RERTE. CALLED CLRNC. CHANGED RTE BACK TO SLC 094 DEG RADIAL MTU 303-MTU-HBU. TWR CLRED US INTO POS ON RWY 34R TO HOLD AS I WAS REPROGRAMMING RNAV FOR CHANGED RTE (AGAIN) PLACED DEP CTL FREQ IN VHF TO PREPARE FOR TKOF CLRNC AND GET BACK TO RNAV TO FINISH. PRETTY SURE I RESPONDED 'POS AND HOLD ON RWY 34R' ON 119.05 (TWR) FREQ AS WE WENT INTO POS. FINISHED PROGRAMMING AS WE LINED UP ON RWY; NOBODY WAS TALKING; OTHER PLT AFTER ABOUT 30-45 SECONDS SAID 'OH NO; WE'RE ON DEP FREQ!' AND WE WERE ON 135.5! I MUST HAVE INADVERTENTLY CAUGHT HEEL OF MY HAND ON FREQ SWITCH AS WE WENT INTO POS. CALLED TWR IMMEDIATELY AND CTLR WAS HOT. SAID HE TRIED TO CALL US 5 OR 6 TIMES; THAT WE CAUSED A GAR ON HIM. I SAID WE DID ACKNOWLEDGE 'POS AND HOLD.' HE SAID NO WE DIDN'T AND THEN QUITE CONFRONTATIONALLY SAID 'IF YOU WANT ME TO PULL THE TAPES; I WILL.' WE SAID 'NOT NECESSARY.' ACCEPTED OUR TKOF CLRNC AND LEFT SLC. IT WAS MOST UNFORTUNATE FOR ALL PARTIES INVOLVED BUT I GUESS EVERYTHING TURNED OUT OK. SUPPLEMENTAL INFO FROM ACN 353330: I SUSPECT THAT THE LINE CHK AIRMAN HAD SWITCHED THE RADIO TO AN INCORRECT FREQ JUST AFTER I ANSWERED AND COMPLIED WITH THE CLRNC TO TAXI IN POS AND HOLD. THE PROB WAS CONTRIBUTED TO BY THE FACT THAT WE RECEIVED 2 AMENDED CLRNCS; THE LAST JUST PRIOR TO TKOF. EACH TIME WE HAD TO RETURN TO CLRNC DELIVERY FREQ. SUPPLEMENTAL INFO FROM ACN 353326: THIS SIT COULD HAVE BEEN AVOIDED BY NOT HAVING TO CHANGE OUR CLRNC 3 TIMES IN A MATTER OF 10 MINS. THE LAST CHANGE OCCURRED AS WE WERE PREPARING OUR ACFT FOR THE TKOF ROLL.