ATC UNABLE TO ESTABLISH RADIO CONTACT WITH ROTARY WING TFC PERFORMING EMS SVC.

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WHILE ON STANDBY FOR A STREET SCENE; I TURNED OFF THE COM 1 MONITOR SWITCH TO AVOID ATC TFC CUTTING IN WHILE I WAS GETTING L2 INFO FROM OUR FLT COMS. WHEN TOLD TO RESPOND I FAILED TO TURN THE SWITCH BACK ON. THIS WOULD ALLOW ME TO HEAR ATC ONLY WHEN I HAD THE XMIT SELECTOR IN THAT POS. EVERYTHING WENT SMOOTHLY UNTIL THE RETURN TRIP BACK TO THE HOSPITAL. THE CREW WAS VERY BUSY WITH THE PATIENT SO I WAS WORKING SEVERAL RADIOS AT ONCE. I MADE THE INITIAL CALL TO ATC AND THEY RADAR IDENTED ME. I TOLD THEM WHERE I WAS GOING AND MY ALT. I THEN SWITCHED TO THE OTHER RADIOS; TALKING TO THE HOSPITAL AND TO FLT COM; THINKING I STILL HAD THE CAPABILITY TO MONITOR ATC. WHEN I WAS ABOUT 1 MI FROM AIR FORCE BASE. I WONDERED WHY APCH HAD NOT HANDED ME OFF. LOOKING DOWN I THEN SAW THE MONITOR SWITCH OFF. CALLED ATC AND FOUND THEY HAD CALLED ME SEVERAL TIMES AND HAD TO RERTE SOME MIL TRAINING ACTIVITY IN THE PATTERN AT AIR FORCE BASE. IN THE FUTURE; I'LL CHK MY AUDIO PANEL MORE CLOSELY BEFORE EACH TKOF.