Here's a basic script you can try.
Download https://www.autohotkey.com/
If you have Biab running As Administrator go to the install folder
C:\Program Files\AutoHotkey and set AutoHotkey.exe to Run As Administrator.
Run my script.ahk

You can put any name on the end of the button code
Gui, Add, Button, x430 y80 h38 w130 gAction08, Action?

and it will run the Action08: function below in the code.

You can style it with some colored buttons.

Copy the text into notepad and save as my script.ahk
Code:
#NoEnv
#SingleInstance Force


TransColor = D4D1C8
Gui, Color, %transColor%


Gui, Font, S10 CBlack Bold, Arial
Gui, Font, 03b1fc


Gui, Add, Button, x10 y10 h38 w130 gAction01, Insert 4 A bars
Gui, Add, Button, x150 y10 h38 w130 gAction02, Insert 4 B bars
Gui, Add, Button, x290 y10 h38 w130 gAction03, Set A
Gui, Add, Button, x430 y10 h38 w130 gAction04, Set B

Gui, Add, Button, x10 y80 h38 w130 gAction05, Insert 4 bars
Gui, Add, Button, x150 y80 h38 w130 gAction06, Delete 4 bars
Gui, Add, Button, x290 y80 h38 w130 gAction07, Action?
Gui, Add, Button, x430 y80 h38 w130 gAction08, Action?

Gui, Font, S20 CBlack Bold, Arial

Gui, Add, Button, x100 y150 h30 w30 gAction09, ^
Gui, Add, Button, x100 y200 h30 w30 gAction10, V
Gui, Add, Button, x75 y175 h30 w30 gAction11, <
Gui, Add, Button, x125 y175 h30 w30 gAction12, >

Gui, Font, S20 cBlue Bold, Arial
Gui, Add, Text, x100 y300, Some Text

;GUI, Color, 333333
Gui, +AlwaysOnTop
Gui, Show, x277 y206 h640 w600, Action Buttons, 

return



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

WinMenuSelectItem, ahk_class TBandWindow, , Edit, Insert Bar(s)...
Sleep, 200
Send, 4
Send, {ENTER}
Sleep, 200

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, 100
Send, {ENTER}


Return

Action02:
winactivate,ahk_class TBandWindow
Send, {RIGHT} 
Send, {LEFT}
WinMenuSelectItem, ahk_class TBandWindow, , Edit, Insert Bar(s)...
Sleep, 200
Send, 4
Send, {ENTER}
Sleep, 200

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


;winactivate,ahk_class TBandWindow
Send, ^+v ;send ctrl+shift+v to Biab (paste chords from clipboard)
;Sleep, 100
Send, {ENTER}
Return

Action03:
winactivate,ahk_class TBandWindow
Send, {RIGHT} 
Send, {LEFT}
Sleep, 200
Clipboard := "[Chords]`n|a)%|`n[ChordsEnd]" ; "`n" = new line



Send, ^+v ;send ctrl+shift+v to Biab (paste chords from clipboard)
Sleep, 100
Send, {ENTER}

Return

Action04:
winactivate,ahk_class TBandWindow
Send, {RIGHT} 
Send, {LEFT}
Sleep, 200
Clipboard := "[Chords]`n|b)%|`n[ChordsEnd]" ; "`n" = new line


Send, ^+v ;send ctrl+shift+v to Biab (paste chords from clipboard)
;Sleep, 200
Send, {ENTER}

Return


Action05:
winactivate,ahk_class TBandWindow
Send, {RIGHT} 
Send, {LEFT}

WinMenuSelectItem, ahk_class TBandWindow, , Edit, Insert Bar(s)...
Sleep, 200
Send, 4
Send, {ENTER}
Return

Action06:
winactivate,ahk_class TBandWindow

WinMenuSelectItem, ahk_class TBandWindow, , Edit, Delete Bar(s)...
Sleep, 200
Send, 4
Send, {ENTER}
Return

Action07:
winactivate,ahk_class TBandWindow

Return

Action08:
winactivate,ahk_class TBandWindow

Return

Action09:
winactivate,ahk_class TBandWindow
Send  {UP}
Return

Action10:
winactivate,ahk_class TBandWindow
Send  {DOWN}
Return

Action11:
winactivate,ahk_class TBandWindow
Send  {LEFT}
Return

Action12:
winactivate,ahk_class TBandWindow
Send  {RIGHT}
Return




GuiClose:
GuiEscape:
ExitApp

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Action-Script.png (9.79 KB, 94 downloads)