AN A300-600 FREIGHTER DEPARTING RWY 33 AT YYZ TURNS EARLY OFF THE NOISE ABATEMENT PROC; AT THE CTLR'S REQUEST. CTLR QUESTIONS THEIR TURN AS BEING IN VIOLATION WITH THE PUBLISHED PROC.

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WE WERE ASSIGNED THE RWY 33 DEP OF THE CYYZ 3 SID. THIS CALLS FOR A DOGLEG AFTER TKOF WITH NO UNAUTH TURNS PER THE NOISE ABATEMENT PROC UNTIL REACHING 3600 FT AND MALTN INTXN. AFTER TKOF AND INTO THE FIRST L TURN; ATC ASSIGNED US A SW HDG (I THINK 220 DEGS). WE TOOK THIS AS AUTH TO CONTINUE THE TURN. ATC CAME BACK STATING THAT WE HAD TURNED EARLY IN VIOLATION OF THEIR NOISE ABATEMENT PROC. I SAID THAT I MISUNDERSTOOD HIS INSTRUCTION; ONLY HEARING THE VECTOR. HE SAID WE NEEDED TO FOLLOW THE PROC (A R TURN THEN L) PRIOR TO TAKING THE VECTOR. NEITHER THE FO NOR I REMEMBER HIM STATING INSTRUCTIONS TO COMPLY WITH NOISE ABATEMENT PRIOR TO TAKING THE VECTOR. I BELIEVE WE JUST MISCOMMUNICATED DURING A HIGH WORKLOAD TIME IN THE DEP. SUPPLEMENTAL INFO FROM ACN 434344: AT 11000 FT MSL; I STARTED THE L TURN TO HDG 320 DEGS TO INTERCEPT THE YYZ 343 DEG RADIAL. WHILE IN THE TURN; DEP CTL TOLD US TO TURN TO HDG 240 DEGS. I CONTINUED THE TURN TO 240 DEGS. AT ABOUT 3000 FT MSL; DEP CTL TOLD US WE SHOULD HAVE DELAYED OUR TURN UNTIL PASSING 3600 FT PER THE SID. I DON'T RECALL THEM MENTIONING FOR US TO COMPLY WITH ANY NOISE ABATEMENT PROCS WHEN GIVING US THE TURN TO 240 DEGS. IF THEY DID; I WOULD HAVE UNDERSTOOD THAT TO MEAN -- COMPLY WITH THE CANADIAN VMAP-A NOISE ABATEMENT CLB PROFILE; WHICH WE DID. IF THEY WANT US TO DELAY A DIRECTED TURN; THEY SHOULD SAY 'AFTER PASSING 3600 FT' OR 'AFTER MALTN INTXN; TURN TO XXX DEGS.