I'm doing a series of podcasts and live interviews of musicians in their home environment using the MZ-M100 with its provided stereo mic. The mic is excellent for voice quality, however, I'm picking up all the ambient noises such as air conditioner in another room or a fan. Any suggestions on what to do to improve the quality. Should I get another mic, if so what kind? Budget is about $200 unless I can use this one I'm not recording music.