I am having trouble with my canon xha1. I was told by a reliable friend to always shoot outdoors with the line setting on instead of mic... When I put my line setting on the my wireless (sennheiser ew 100 g2) will pick up but not my shotgun (azden smgpdII). I did some reasearch and it seems that some mics are "line gradient". Do I have to have one of these mics to shoot on the line setting? I am in the middle of a shoot so any advice would be great ASAP.