Buttr Buttr FX with BONUS Purchase OptionButtr is a powerful guitar composition tool built from thousands of studio recorded chords performed by real guitarists, delivering the authentic feel of a live player. It features artist curated voicings, chord progressions, and FX presets, with intuitive browsing by key, chord quality, variation, playstyle, and guitar type. Users can quickly build custom progressions while maintaining realistic performance nuancesno session guitarist requiredand