Thanks for the comments everyone, the set up at that time was simply a cheap desk mike into the PC and recorded into sonar. I was then at the very early stages of music producing so I hadn't much of an idea what I was doing. I then changed over to a set of internal mikes which had been pre built into the accordion. Early this year I invested in a prosperous studio mike which is fantastic for recording music and ALSO for recording my radio programmes on twangtownusa.com I also got a cast iron mike desktop mike stand from amazon. Weighs a ton but works beautifully. I've now got something padded like a towel under the mike & stand and that seems to cut out all background rumble & hum