VFR AA1 ENTERING TFC PATTERN AT OSU IS ON INCORRECT FREQ.

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DEPARTED TZR TO OSU. ADVISED TZR GND THAT I WAS VFR TO OSU. I WAS INSTRUCTED TO DEPART RWY 22 WITH A R TURN NBOUND TO OSU. AFTER LEAVING TZR GND CTL; I HAD PLACED BOTH TWR FREQS IN COM #1 (TZR IN ACTIVE; OSU IN STANDBY) AND OSU ATIS IN COM #2. TZR TWR REQUESTED CONFIRMATION THAT I WAS NBOUND TO OSU AND I REPLIED IN THE AFFIRMATIVE. UPON CLRING TZR CLASS D; SWITCHED TO OSU ATIS FOR LNDG INFO ON COM #2. RETURNED TO COM #1 ON WHAT I THOUGHT WAS OSU TWR; HOWEVER; I MUST HAVE INADVERTENTLY RETURNED COM #1 TO TZR RATHER THAN OSU. MADE POS RPT ON COM #1 STATING THAT I WAS 6 MI SW INBOUND WITH ATIS INFO. TWR RESPONDED TO MAKE R TFC FOR WHAT I THOUGHT I HEARD WAS RWY 27L. I ACKNOWLEDGED THAT I WAS TO ENTER R-HAND TFC RWY 27L. THIS SEEMED VERY STRANGE AND NON STANDARD. I THEN REPLIED 'CONFIRM YOU WANT R-HAND TFC RWY 27L FOR ACFT X.' THE CTLR REPLIED 'AFFIRMATIVE; R-HAND TFC; WE HAVE AEROBATIC IN PROGRESS ON THE L-HAND SIDE OF THE RWY.' I CONTINUED INBOUND TO OSU XING THE RWY 27L DEP PATH ABOUT 3.5 MI W LOOKING FOR ANY TFC. AT ABOUT 3.3 NM W; THE TWR QUERIED MY POS AND I REPLIED THAT I WAS '3 MI W FOR R-HAND TFC RWY 27L.' HE ROGERED MY RPT. I RPTED ENTERING 'MIDFIELD R-HAND DOWNWIND RWY 27L' AND THE REPLY WAS 'CONTINUE; NOT IN SIGHT.' ABOUT THAT TIME; THE CTLR FINALLY USED THE 'BOLTON TWR' AND I KNEW THERE WAS A SERIOUS PROB IN PROGRESS. I IMMEDIATELY TURNED N TO CLR THE AREA WHILE CONTACTING OSU ON THE APPROPRIATE FREQ. I WAS INSTRUCTED TO CONTINUE THE R-HAND TURN AND SET UP FOR A BASE LEG ENTRY FOR RWY 27L. THE APCH AND LNDG WERE NORMAL; AND NO LOSS OF ANY SEPARATION OCCURRED. THE INCIDENT WAS CAUSED BY MY INATTN TO THE APPROPRIATE RADIO FREQ BEING USED AND SENSE OF FAMILIARITY WITH THE AREA. I EXPECTED TO HEAR RWY 27L; BUT THE CTLR MAY HAVE INDEED SAID RWY 22; WHICH WAS THE ACTIVE I DEPARTED ON JUST 7 MINS EARLIER. SO; INDEED IT WAS A HEARBACK ERROR ON MY PART. HOWEVER; SINCE I HAVE NEVER SEEN OSU OPERATE WITH R-HAND TFC RWY 27L; THAT'S WHY I MADE 1 DEFINITIVE REQUEST FOR CLARIFICATION; AND ANOTHER MORE SUBTLE ATTEMPT. IN BOTH CASES; THE TZR CTLR DID NOT EITHER HEAR ME SAYING RWY 27L; OR FAILED TO CONNECT THAT I WAS HEADED TO OSU AND MIGHT HAVE THE INCORRECT FREQ. NOR DID I HEAR HIM IDENT HIMSELF AS BOLTON TWR TILL THE FINAL XMISSION. UPON LNDG; CONTACTED OSU TWR CAB BY PHONE AND DEBRIEFED SIT. DISCUSSED HOW THE EVENTS OCCURRED AND ASKED HOW THIS NEEDED TO BE RESOLVED. THE CTLR INDICATED THAT THE MATTER WAS CLOSED AND NO FURTHER ACTION NEED BE TAKEN BY ANY OF THE PARTIES. WHILE THE RESPONSIBILITY IS SOLELY MINE; THERE WAS CERTAINLY 2 READBACK/HEARBACK MISTAKES MADE. ADDITIONALLY; NEITHER MYSELF NOR THE TZR CTLR EVER CONNECTED THAT IF I HAD JUST DEPARTED NBOUND; THAT THERE IS NO POSSIBLE WAY THAT I COULD NOW BE SW OF THE ARPT. EVIDENTLY; WE BOTH HEARD WHAT WE EXPECTED TO HEAR; AND RESPONDED ACCORDINGLY. A CLASSIC CASE OF MULTIPLE READBACK/HEARBACK MISTAKES.