M-Audio Pop/Rock Guitar Toolbox Pop/Rock Guitar Toolbox lets you add tasty rhythm and lead guitar to your tracks in styles spanning funk, pop, R&B and blues. Each groove comes with multiple variations on melody and/or tonality for maximum flexibility. Alternate a crisp, clean take for the verse with a crunchy version for the chorus. Or alternate the melody lines to let your track breathe and evolve. Add that essential guitar vibe to your next song.