THE FLC DSNDED THROUGH THE ASSIGNED ALT AND USED THE VOR RWY 36L WHEN THE CTLR INTENDED THE FLT USE THE ILS RWY 35.

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DURING CRUISE AT 9000 FT; WE RECEIVED CLRNC TO DSND TO 6000 FT AND EXPECT VOR/DME RWY 36L. THE CAPT STARTED DSCNT TO 6000 FT AND CALLED FOR APCH CHKLIST. CHKLIST WAS COMPLETED AND FO REVIEWING APCH PLATE. WHEN THE FO LOOKED UP; THE CAPT HAD DSNDED THROUGH THE ASSIGNED ALT OF 6000 FT. THE CAPT RECOVERED AT 5700 FT AND RETURNED BACK TO 6000 FT. ATC ASKED IF WE STARTED OUR DSCNT TO 1600 FT YET. (THERE WAS COM BUT IT WAS BLOCKED BY OTHER ACFT.) WE NEVER RECEIVED CLRNC TO DSND. ATC ADVISED US TO EXPEDITE OUR DSCNT AND TO EXPECT VECTOR ACROSS FINAL APCH COURSE RWY 36L FOR SEQUENCE. BEING E OF COURSE ATC NOW TOLD US TO TURN L TO HDG 355 DEGS CLRED 'APCH.' WHEN ACFT BROKE OUT IN VFR CONDITIONS AT 3000 FT; WE WERE LINED UP FOR RWY 35 (8-10 NM FROM ARPT) SLIGHTLY TO THE R OF COURSE ON VOR/DME RWY 36L. ATC TOLD US TO CONTACT TWR ON 118.45 WHICH WAS ASSIGNED FREQ FOR THAT RWY (FREQ FOR RWY 36L IS 124.3). CREW WAS NEVER ADVISED ABOUT APCH AND RWY CHANGE. (THERE WERE SEVERAL BLOCKAGES OF COM AT THE TIME OF APCH.) FO ASKED THE CAPT IF HE KNEW ANYTHING ABOUT APCH AND RWY CHANGE (MAYBE I MISSED IT). HE DIDN'T KNOW ANYTHING EITHER! THE REST OF THE APCH AND LNDG WAS UNEVENTFUL. ATC TRAINING WAS IN PROGRESS AT ORLANDO INTL ARPT DURING APCH! CHAIN OF EVENTS: 1) CREW WAS FLYING 2- DAY TRIP; FIRST DAY WITH 9 FLT SEGMENTS WITH MINIMUM REST IN BTWN DAY 1 AND DAY 2. 2) CREW FLYING NON AIR- CONDITIONED ACFT DURING DAY 1. AVERAGE TEMP PLUS 95 DEGS F. 3) RADIO COM BLOCK ON SEVERAL OCCASIONS. ATC NEVER MADE SURE ACFT RECEIVED CLRNC ON SEVERAL OCCASIONS. 4) ATC TRAINING WAS IN PROGRESS DURING ARR INTO ORLANDO. 5) DISTR IN COCKPIT DURING APCH.