PVT PLT HAS A DIFFICULT TIME FLYING IN CLR AIR TURB AND UNDERSTANDING ATC CLRNC PHRASEOLOGY.

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ON MAY/WED/95; I DEPARTED SBN ALONE AT XA50Z IN BONANZA (BE-AR36/R) ON AN IFR FLT PLAN TO MSP. I HAD 2 OCCURRENCES NEAR FARMINGTON VOR WHICH CAUSED A DEV FROM ASSIGNED ALT AND HDG. FIRST; I DEVIATED FROM AN ASSIGNED ALT OF 6000 FT AND FLEW AS HIGH AS 6450 FT FOR A PERIOD OF LESS THAN 30 SECONDS. I HAD BEEN HAVING SOME TROUBLE HOLDING EXACT ALT DUE TO MODERATE TURB; AND WHILE READING A CHART; RECEIVED A CALL FROM ZMP REMINDING ME THAT THE LCL ALTIMETER WAS; IE; 30.18. AT THAT TIME I CONFIRMED I HAD THE CORRECT ALTIMETER SETTING AND DSNDED BACK TO 6000 FT. TO PREVENT THIS FROM HAPPENING AGAIN I BELIEVE I SHOULD REQUEST A DIFFERENT ALT TO AVOID MODERATE TURB; OR AT THE VERY LEAST NOTIFY ATC OF MY SIT WITH TURB; ALSO; I SHOULD BE MORE VIGILANT IN MAINTAINING ALT. SECOND I DEVIATED FROM COURSE AFTER MISUNDERSTANDING AN ALT RESTR CLRNC FROM ATC. I WAS APPROX 30-40 NM SE OF THE FGT VOR ON V171 FLYING TOWARD FGT WHEN I RECEIVED WHAT I BELIEVE TO BE THE FOLLOWING CALL FROM ATC: 'BEECH CROSS 25 MI S OF FARMINGTON VOR AT 4000 FT.' I READ BACK THE INSTRUCTIONS AND UNDERSTOOD THAT I WAS TO FLY TO A POINT 25 NM S (ON A 180 DEG RADIAL ) OF FGT AND TO HAVE DSNDED TO 4000 FT BY THAT POINT. I DIALED IN A RNAV WAYPOINT 25 NM ON THE 180 DEG RADIAL FROM FGT; TURNED L TO FLY TO THAT RNAV POINT AND BEGAN TO DSND TO 4000 FT. WITHIN A VERY SHORT TIME; ATC CALLED BACK AND SAID THAT I HAD NOT BEEN GIVEN A DIFFERENT HDG AND ASKED WHY I WAS OFF COURSE. I RELAYED MY UNDERSTANDING OF THE PREVIOUS INSTRUCTIONS AND WAS TOLD TO FLY 360 DEGS (TO JOIN BACK UP WITH V171) AND TO TELEPHONE WHEN I GOT TO THE GND. AFTER LNDG AT MSP; I DID CALL AND TALKED TO WHO INSTRUCTED ME THAT I HAD MISUNDERSTOOD THE CTLR'S INSTRUCTION. WE DISCUSSED THE PROPER PHRASEOLOGY AND THE CORRECT FLT RESPONSE TO THE ALT RESTR PHRASEOLOGY. IN THE FUTURE; I WILL BE ABLE TO COMPLY WITH ALT RESTR CLRNCS NOW THAT I UNDERSTAND ATC PHRASEOLOGY AND THE PROPER FLT RESPONSE.