7-String Guitar Chord Chart and Tabs in 4th steps chord Tuning

BbM11, BbΔ11, Bb maj11
Notes: B♭, D, F, A, C, E♭
10,8,8,8,8,10,9 (3111142)
10,10,x,10,10,10,10 (11x1111)
10,8,8,8,8,x,9 (31111x2)
10,8,8,x,8,10,9 (311x142)