Originally Posted By: Matt Finley
I believe a dim chord is by definition a dim5 (and a flatted 5 at that). Here's the thing: I have never seen 'dim5' anywhere outside of BIAB. If you want a dim7, you have to write dim7. So in my opinion the correct way to set it in BIAB display settings is to say dim=dim5. It looks like you agree.

I guess. It certainly is a confusing thing to have to remember, and I would really rather not have preferences like that.

I would let "dim" mean "diminished triad", with "dim7" meaning the obvious and "dim5" eliminated. This may inconvenience those who say "diminished" to refer to 4-note chords and so would prefer to use "dim" for them, but so it goes. Courting this type of confusion to try to please everyone is nuts.