Try changing this then try button 1

Code:
Action01:
winactivate,ahk_class TBandWindow
;Send, {RIGHT} 
;Send, {LEFT}

WinMenuSelectItem, ahk_class TBandWindow, , Edit, Insert Bar(s)...
Sleep, 300
Send, 4
Send, {ENTER}
Sleep, 300

Clipboard := "[Chords]`n|a)%|%|%|%|%|%|%|%|`n[ChordsEnd]" ; "`n" = new line


;winactivate,ahk_class TBandWindow
Send, ^+v ;send ctrl+shift+v to Biab (paste chords from clipboard)
Sleep, 300
Send, {ENTER}


Return