ON DSCNT; FLC DEVIATED FROM ASSIGNED ALT AND MADE VISUAL APCH TO LAND.

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UPON COMPLETING A DSCNT AND IN-RANGE CHKLIST AND A PAX BRIEFING; I CONTACTED THE FSS FOR TA'S AND LCL CONDITIONS AT THE ARPT. AS THE PNF; I TOOK NOTES AS THE INFO WAS BEING DISSEMINATED; SO I MAY REITERATE THEM TO MY FO; AS HE WAS BUSY FLYING THE ACFT AND MONITORING CTR DURING OUR DSCNT. AS I CONCLUDED MY CONTACT WITH THE FSS; I CHKED BACK ON WITH MY FO AND I DECLARED I WAS RESUMING COMS WITH CTR. THROUGHOUT THE DSCNT; MY FO AND I MAINTAINED VISUAL CONTACT WITH THE DEPARTING TFC FROM AT LEAST 20 NM. UNFORTUNATELY; WE DEVIATED FROM AN ASSIGNED ALT DURING THE DSCNT AS WE STEERED WELL CLR OF THE DEPARTING TFC. I WAS CONVINCED WE WERE CLRED FOR A VISUAL APCH AND WE WERE MAINTAINING VISUAL SEPARATION. SOON THEREAFTER; WE EXECUTED A VISUAL APCH AND LANDED; CANCELING IFR ON THE GND WITH THE JBR FSS. THE GAP IN COM BTWN MY FO AND I; AND ATC; WAS AN OVERSIGHT ON MY PART; WHICH CONTRIBUTED TO AN ALTDEV. I HAVE LEARNED THAT NO MATTER HOW BUSY I MAY BE WHILE CONDUCTING TASKS AS PNF DOES NOT RELIEVE ME OF MY RESPONSIBILITIES AS PIC OF MY ACFT. AS A RESULT; I NOW CONDUCT OPS INCREASINGLY PRECISELY AND CONCISELY.