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How do I type in the chord G,B,Db,Gb? What is it called? Sorry for my musical ignorance.



try F#sus/G (type f3sus/g in the box). That seems to work ok, the bass alternates between G and Db, if I'm guessing right that's the sound you're going for. The name for that would be Gmaj7b5, in lieu of some other context that would make the name, well, something else.

you'd think Bsus2/G would work too, but the bass then alternates between G and F# -- it looks like BIAB parses the bass in slash chords by taking the root (or maybe better to say the bass note that will sound on beat 1) from the right side of the slash, and the fifth from the left side of the slash.

anyway give it a shot, hope that helps