4-String players have a history of being adventurous with tunings, whether they play cigar-box guitar, tenor guitar, ukulele, tenor banjo, bouzouki, or even mandolin or mandola. We've played around with open tunings, guitar-derived tunings, fiddle-derived tunings, and just making it up as we go along. But, no-one wants to mess about working out all the chords for some new tuning you're considering. That's where this tool comes in. Just set your tuning and check out all the different chord inversions we can generate for it.