Not sure what you mean by 'substitute chord'

BAdd 11 might be played as B, D# F# A C# E, with E being the 11th

Normally with an 11th the 7th is played also, meaning the A

I think in BiaB the 11ths are all only available as #11th.

Does a Bsus give you what you want?


(Not sure if this helps or complicates for you though, sorry if it does)




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