DC10 CREW SELECTS WRONG FREQ AMIDST DEP CONFUSION.

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WE WERE INITIALLY CLRED FOR THE DUDES 9 DEP; MAINTAIN 11000 FT AND DEP ON 127.4. WHEN WE WERE CLRED FOR TKOF; THE ALT WAS AMENDED TO 2000 FT MSL. AT 400 FT AGL; WE STARTED A TURN TO 120 DEGS. THE TWR POINTED OUT TFC AT 11 O'CLOCK AND 3000 FT. IT TOOK ABOUT 1 MIN TO LOCATE THE TFC AND RPTED IT TO THE TWR. THEY THEN HANDED US OFF TO DEP. AT THAT POINT WE WERE LEVELING OFF; ACCELERATING; BRINGING THE FLAPS UP; AND MAINTAINING CONTACT WITH THE TFC. INSURING THE LEVELOFF WAS COMPLETED. I CALLED DEP CTL AT THE SAME TIME THE CAPT RPTED A PROB WITH THE FMS INDICATIONS. AFTER ABOUT 2 MINS; I REQUESTED HIGHER ALT BECAUSE IT DID NOT SEEM RIGHT TO STAY THIS LOW. THERE WAS NO RESPONSE FROM DEP CTL. I CALLED THE TWR FREQ. THEY SAID DEP WAS TRYING TO CONTACT US AND TO USE FREQ 127.4. WE CONTACTED DEP CTL; RECEIVED VECTORS AND HIGHER ALT. NO FURTHER INCIDENT. THE DISTR OF TFC; A LOW ALT LEVELOFF; AND A MINOR MALFUNCTION CAUSED THE ERROR IN SETTING DEP CTL FREQ NOT BE DETECTED. MORE DILIGENCE IN SETTING THE FREQS AND TO INSURE A RESPONSE IS RECEIVED WHEN YOU CHK IN WITH A NEW FACILITY.