A diminished 7 chord does not have a 6 in it. It's one of the 4 voice harmonized diatonic scale chords, the one based on the 7th note. Anyway, a G#dim7 has an f# rather than an f. A nice substitution is a Bminor. It has 3 of the notes of the G#dim7, all except g#. you won't miss the root, most likely. Otherwise, from low to high you can play 2 1 0 2 and that has all of the chord tones
Thanks for setting me straight. I’ve been screwing that up for decades probably. I have thought that a min7b5 was the same as dim7. When I play a dim chord it has a min 3 flat5 and maj6. I tend not to think of it as a double flat 7, which is the source of my error here I think. Do you play a different chord for dim and dim7?
Hello Mitch, I try to look at the standard notation in order to verify whatever they are calling it. If that is not available and I have time I will test the harmony of the b7 and bb7 intervals on their own. Regards, Rick