NMAC BTWN A MOONEY ON FINAL AND A PIPER AZTEC PASSING 200 FT UNDERNEATH THE MOONEY FOR A LOW PASS.

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I WAS THE WING MAN IN A FLT OF 2 APCHING BDR FOR AN OVERHEAD APCH TO A LNDG. LEAD WAS THE PIPER AZTEC; I WAS WING MAN IN A BEACH BARON. WE WERE IN A L ECHELON FORMATION AT 1000 FT MSL. TWR HAD A MOONEY APCHING FOR A LNDG ON RWY 24 FROM THE R BASE. WE WERE INSTRUCTED TO CLB TO 1500 FT FOR THE OVERHEAD. I HAD BEEN IN CONTACT WITH LEAD ON THE OTHER COM RADIO AND THE CLB COMMAND WAS GIVEN. I TOOK MY EYE OFF OF LEAD FOR A SECOND TO LOOK AT MY ALTIMETER AND WHEN I LOOKED BACK AT LEAD; HE WAS GONE FROM SIGHT. AT THAT POINT; I HEARD THE MOONEY; WHICH WAS NOW ON FINAL; CALLED OUT ON THE FREQ; 'HEY; THE BARON JUST FLEW UNDER US!' I (IN THE BARON) STATED ON THE FREQ THAT I WAS OVER THE NUMBERS AT 1500 FT AND IT MUST BE THE AZTEC THAT PASSED UNDER THE MOONEY.' AGAIN; I TRIED TO CONTACT MY LEAD (THE AZTEC) AS DID THE TWR; BUT HE DID NOT RESPOND. I THEN ACQUIRED HIM VISUALLY DEPARTING THE PATTERN NWBOUND. I COMPLETED MY OVERHEAD BREAK AND LANDED. A FEW MINS LATER THE AZTEC CONTACTED THE TWR AFTER A SUPPOSED LOSS OF COM AND LANDED. WHEN WE DEBRIEFED ON THE GND AFTER THE FLT; THE LEAD PLT STATED THAT HE KNEW WE WERE DOING THE OVERHEAD BREAK ENTRY; BUT FOR SOME REASON; HE MISTOOK THAT FOR MEANING WE WOULD DO A LOW APCH BEFORE THE BREAK. ALSO; SINCE HE KEPT DSNDING; HE HAD TO MANEUVER TO AVOID THE MOONEY; WHICH HE WOULDN'T HAVE HAD TO IF HE STAYED AT 1000 FT OR 1500 FT AS INSTRUCTED BY ATC. HE ALSO STATED THAT AT THE MOMENT; DSNDING UNDER THE MOONEY APPEARED TO HIM AS THE APPROPRIATE ACTION TO TAKE AT THAT POINT; AND SOMEHOW DURING HIS MANEUVERING HE ACCIDENTALLY TURNED DOWN THE RADIO VOLUME. I CONTACTED THE TWR MGR AS WELL AS ONE OF THE PLTS IN THE MOONEY; AND THE OPERATOR OF THE MOONEY TO DISCUSS WHAT HAPPENED AND THE SIT WAS RESOLVED WITH THEM. A FACTOR THAT WOULD OR COULD HAVE ALLEVIATED THIS SIT WAS POSSIBLY A MORE THOROUGH BRIEFING BTWN MYSELF AND THE LEAD PLT TO MAKE SURE WE BOTH UNDERSTOOD THE PATTERN ENTRY PROC FOR THE OVERHEAD APCH.