I'm recording some rough acoustic demos right now using a SM58, which is connected through the direct-in on my MacBook (using Garagband). I'm using an XLR to 1/4" converter cable and then a 1/4" to 1/8" converter cable, which then goes to the direct-in jack. Could this be cutting down the response level of my SM58? I had to layer 8 of the same guitar track to get a good level. Should I spring for a condensor mic (I think that's what you're "supposed" to recording acoustic with if I'm not mistaken) or an audio interface if the converter cables are the problem? Any help would be great!