AN ACR LGT DSNDED IN RESPONSE TO A TCASII COMMAND.

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IT WAS FEB/SUN/93 AFTERNOON ON A NICE DAY. CLRED ON THE PRADO DEP TO 7000 FT. AFTER TKOF; TOLD TO LEVEL AT 5000 FT FOR TFC. WE STOPPED AT 5000 FT. DEP CALLED THE TFC AT 10 O'CLOCK ABOUT 2 MI AT 6000 FT. WE GOT HIM IN SIGHT. THEN TCASII SAYS 'TFC.' IT SHOWS ANOTHER TARGET AT 1-2 O'CLOCK ABOUT 2 MI LEVEL AT OUR ALT. TCASII THEN SAYS 'DSND' SO WE DO TO 4500 FT. FINALLY ACQUIRED THE TARGET VISUALLY AT 1 MI ON COLLISION COURSE AND ATC; WHO WAS VERY BUSY A THE TIME; CALLS OUT THE TFC. THIS CTLR'S VOICE WAS DIFFERENT FROM THE ORIGINAL VOICE. THE INSTRUCTOR HAD TAKEN OVER FOR THE TRAINEE. THE AREA OVER PDZ VOR IS VERY CROWDED. THIS AREA NEEDS VFR CORRIDORS AND A LARGER ARSA. THE OTHER ACFT WAS A HIGH WING SMA TYPE HDG NE AT 5000 FT; AN IFR ALT. SUPPLEMENTAL INFO FROM ACN 233699: WE NOTIFIED ATC OF OUR DSCNT AT WHICH TIME THEY BEGAN ISSUING ADVISORIES BUT WHAT WAS SAID WAS UNINTELLIGIBLE. CTLR WAS VERY BUSY WITH NUMEROUS ACFT; MOSTLY VFR. OUR CONVERGING TFC APPARENTLY WAS VFR BUT WAS NOT FLYING AT VFR ALT.