That happens occasionally with mine. First thing I do is listen to it at the location and adjust the mic position and the mic level so that nothing's buzzy. Since you had some of the buzzing though, my advice would be to copy + paste from a similar section if you played the same thing more than once. Finding a natural sounding way to do this can take a little time, but if the buzz bothers you that much it would be worth it. In Mixcraft and most programs, you can control the volume of individual areas within a track. I just messed with the EQ and Compression alongside that volume and it reduced the buzzign alot. for tonal purposes though, next time make sure you aren't peaking before you start playing :) Hope that helps.