C172 PLT HAD CLRNC MIXUP WITH ATC.

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SOFT IFR CONDITIONS PREVAILED. I FILED AN IFR FLT PLAN WITH BURLINGTON; VT; FLT SVC FOR A FLT FROM ALB TO GFL FOR A PRACTICE APCH. I TOLD THE BRIEFER I WOULD PROBABLY ALSO DO APCHS AT SARATOGA SPRINGS; NY (5B2) AND SCHENECTADY; NY (SCH). I COMPLETED THE ILS 1 AT GFL AS A LOW APCH; AND RPTED BACK TO ALB APCH THAT I WOULD LIKE TO PROCEED TO 5B2 FOR THE VOR A. THE CTLR ASKED ME IF I HEARD HIM SAY 'CANCEL IFR WITH ME IN THE AIR OR WITH BURLINGTON ON THE GND.' I REPLIED THAT I HADN'T. THE CTLR THEN INFORMED ME THAT MY FLT PLAN HAD BEEN TO GFL ONLY WITH NO OTHER APCHS ANYWHERE ELSE; AND THAT MY LOW APCH TO GFL WAS UNAUTH. I WAS THEN VECTORED TO 5B2 FOR THE VOR-A IN A VERY ROUNDABOUT WAY. I'VE FILED AND FLOWN MANY OTHER ROUND-ROBINS JUST LIKE THIS WITHOUT A PROB. I SHOULD HAVE SPECIFICALLY NOTED WITH FLT SVC THAT THIS TRIP WOULD BE ONE WITH MULTIPLE APCHS; AND THEN CONFIRMED THAT WITH THE ALB DEP CTLR AS I WAS BEING VECTORED TO GFL. BECAUSE OF THE MARGINAL VISIBILITY THAT DAY; THE CTLRS WERE VERY BUSY; AND I'M SORRY THAT I INADVERTENTLY ADDED TO THEIR STRESS LEVELS WITH THE CONFUSION. THE ALB CTLRS ARE A PROFESSIONAL AND DEDICATED GROUP OF INDIVIDUALS; AND THEY HANDLED THIS SIT IN STRIDE.