CLRNC INTERP; 10000 FT FOR 11000 FT. ALTDEV ALT OVERSHOT.

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WE HAD A XING ALT AT JIBES; AND WE HAD FMS PROBS THAT CAUSED CONFUSION ON THIS FIX. THE CTLR VECTORED US OFF COURSE TO AVOID THIS PROB. THE NEXT CLRNC WAS CONDITIONAL (DSND TO 10000 FT; OUT OF A CERTAIN ALT; TURN R; INTERCEPT TO ARR; CONTACT APCH CTL ON FREQ XXXX; WE WERE AT 10000 FT SEVERAL MINS AND APCH ASKED US WHAT ALT WE WERE AT. THEN HE TOLD US TO CLB TO 11000 FT; WE DID. I DO NOT KNOW IF WE MISUNDERSTOOD THE CLRNC OR NOT. BUT WE DID WHAT WE THOUGHT OUR CLRNC WAS. I BELIEVE THE LIST BELOW WOULD HELP CORRECT PROBS LIKE THIS: 1) STOP CONDITIONAL CLRNCS. 2) STOP EXTREMELY COMPLEX CLRNCS. 3) SEPARATE FREQ CHANGES FROM CLRNCS. 4) STOP THE REQUIREMENT TO WEAR HEADSETS. THEY MAY HELP TO NTSB BUT THEY INTERFERE WITH OUR JOB PERFORMANCE. WE ONLY HAVE EARPHONES ON 1 EAR AND SPEAKERS OFF; SO IF YOU HAVE ANY HEARING LOSS YOU MAY BE MISSING SOMETHING. WHEN SPEAKERS WERE USED YOU HAD A STEREO EFFECT. SUPPLEMENTAL INFO FROM ACN 233872: I BELIEVE THAT VOICE COM IS THE WEAKEST LINK IN THE AVIATION SAFETY CHAIN. I ALSO BELIEVE THAT A THIRD CREW MEMBER WOULD REDUCE COM ERRORS. I DON'T THINK THAT HEADSETS ARE ANY IMPROVEMENT OVER SPEAKERS. I ALSO THINK THAT HEADSETS CAN DAMAGE HEARING DUE TO MOMENTARY HIGH VOLUME SETTINGS THAT SOMETIMES OCCUR AT FREQ CHANGES.