LGT FLC ON TURN IN FOR VISUAL TO ATL; 4500 FT; DSNDED TO 4200 FT.

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AFTER ABOUT 4 TURNS OF HOLDING OVER ROME VOR VECTORS FOR APCH (VISUAL) TO 26R AT ATL. VECTORED N OF ARPT HDG E CLRED TO DSND FROM (I THINK) 8000 FT TO 4500 FT AND TURN ABOUT 150 DEGS R TO A VISUAL FINAL. IN TURN WAS ASKED TO SLOW FROM 250 KTS TO 210 KTS. FIELD WAS CLRLY IN SIGHT EARLIER BUT WAS MOMENTARILY OUT OF VIEW DUE TO BROKEN CLOUD COVER DURING TURN. OUR POS WAS HIGH SO I USED FULL SPD BRAKE TO GO/DOWN SLOW/DOWN. DURING LOC INTERCEPT WE RECEIVED AN AURAL 'TFC TFC' WARNING FROM TCASII. DURING THIS DISTR I ALLOWED ACFT TO DSND TO 4200 FT AND THEN CORRECTED BACK TO 4500 FT. I WILL SAY ALSO THAT OUR COMPANY HAD JUST REVISED APCH AND DEP SOP WHICH INCLUDED A RADICAL CHANGE IN AIRSPD BUG PLACEMENT/USAGE AND NEW 'FLIP CARDS' FOR FLAP/APCH SPDS. THE ACFT HAD OLD DATA REMOVED AND NEW TYPE CARDS INSTALLED. WE WERE SUPPOSED TO HAVE BEEN GIVEN MANUAL REVISIONS AND BULLETINS TO EXPLAIN THE NEW PROC. INSTEAD WE RECEIVED ONLY A PRELIMINARY BULLETIN WHICH WE READ ON THE FLT TO ATL. NO ONE WAS SURE WHAT THE PROCS WERE; CAUSING CONFUSION AND DISTR DURING THIS CRITICAL PHASE OF FLT. SUGGEST TCASII OFF WHILE IN TCA; OR ATA; OR BELOW 7000. SUGGEST NO CHANGES IN SOP UNTIL ALL PLTS FULLY INFORMED IN A TIMELY MANNER WITH PROPER PRINTED MATERIALS AND TIME TO REVIEW THEM. SET ALTIMETER WARNING TOLERANCE TO 150.