ACR MLG FAILS TO TURN TO NEW HDG AS ASSIGNED BY DEP CTLR. CREW HAS A PROB WITH 'WHO'S MINDING THE STORE;' TRYING TO TALK WITH COMPANY AND ATC BUT NOT FOLLOWING CTLR'S CLRNCS.

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AFTER TKOF; THE CTLR GAVE US HDG 040 DEGS THEN 360 DEGS WITH REVISED ALT. I ACKNOWLEDGED THE XMISSION AND HAD TO DEAL WITH COMPANY FREQ. I NOTICED THE CAPT; WHO WAS FLYING; AGAIN ACKNOWLEDGED THE SAME INSTRUCTION TO THE CTLR. ON THE COMPANY FREQ SOMEBODY WAS TRYING TO TALK TO THE CAPT. I TOLD THE CAPT TO TALK ON THE COMPANY FREQ AND RETURNED TO THE ATC FREQ; BUT I DID NOT NOTICE THE AIRPLANE WAS FLYING 040 DEG HDG. THEN THE CTLR TOLD US THAT WE WERE SUPPOSED TO GO 360 DEG HDG. THE CAPT NOW TURNED TO 360 DEGS. IN THIS SIT; BOTH HAD TO FLIP-FLOP THE RADIO AND TALKING TO ATC AND COMPANY WHILE ATC INSTRUCTIONS KEPT ON BEING REVISED. AGAIN; PNF MUST MONITOR WHAT PF IS DOING WHILE TALKING TO ATC AND PF MUST PAY ATTN TO THE FLYING FIRST; THEN ENGAGE IN RADIO COMS. IF SO; PNF BECOMES PF NO MATTER HOW BRIEF AND HOW FREQUENT THIS EXCHANGE OF DUTY MIGHT BE. BUT WE ALL TOO OFTEN IGNORE THE OFFICIAL EXCHANGE OF THE DUTY AS IT WILL BE TOO SHORT DURATION OF RADIO COM AND WILL BE ABLE TO MONITOR THE AIRPLANE SUCH BRIEF MOMENT; AND DURING SUCH MOMENT ERROR IS OCCURRING.