I have an acoustic guitar, and I'm playing a riff which consists of chords with hammer-ons and pull-offs. I have a perception 420 mic, it's not the greatest, but I can get a decent sound out of it. I also use my Presonus channel mixer as a pre-amp, since it has a tube overdrive function. My question is, how can I get the hammer-ons and pull-offs to stand out from the the rest of the riff? Right now it sounds muffled and sort of "muddy". Any replies would be greatly appreciated.