I use Goldwave, which you can try out at http:\\www.goldwave.com - its a full version which lets you give it up to 3000 commands before you need to register and pay for it. You can save as wave or mp3, and you can specify various parameters which vary the size of the file you produce. Works really well. Hows the banjo playing coming on, Bonnie? We had Dwight here a couple of weeks ago (with Dave Bing teaching fiddle) - a fine time.
Cheers
Ray