Download https://www.autohotkey.com/ V1
Right click on C:\Program Files\AutoHotkey\AutoHotkey.exe set to "run as administrator" if Biab is set to run as admin..

Right click Save Link/Target As > Center active window.ahk
This will center any active window
run it and it will be in the system tray "H"
the hot key is Ctrl+Y
you can change the hot key to what you want.
# Win (Windows logo key)
! Alt
^ Ctrl
+ Shift

you can edit scripts by dropping in NotePad.

Code:
#NoEnv 
#SingleInstance Force
SendMode Input 
SetWorkingDir %A_ScriptDir% 

^y:: ; hot key = ctrl y
 WinGetTitle, ActiveWindowTitle, A ; Get the active window's title for "targetting" it/acting on it.
 WinGetPos,,, Width, Height, %ActiveWindowTitle% ; Get the active window's position, used for our calculations.

 TargetX := (A_ScreenWidth/2)-(Width/2) ; Calculate the horizontal target where we'll move the window.
 TargetY := (A_ScreenHeight/2)-(Height/2) ; Calculate the vertical placement of the window.
 
 WinMove, %ActiveWindowTitle%,, %TargetX%, %TargetY% ; Move the window to the calculated coordinates.
 
return


Right click Save Link/Target As > Biab open Embellisher center.ahk
This will open Embellisher and center with it's hot key Ctrl+Alt+L
you can add other windows to this script.

Code:
#NoEnv 
#SingleInstance Force
SendMode Input 
SetWorkingDir %A_ScriptDir% 

^!L:: ; send ctrl+alt+L
Winactivate, ahk_class TBandWindow
WinMenuSelectItem, ahk_class TBandWindow, , Melody, Embellish Melody, Embellish Melody Dialog
Sleep, 500
WinGetTitle, ActiveWindowTitle, A ; Get the active window's title for "targetting" it/acting on it.
 WinGetPos,,, Width, Height, %ActiveWindowTitle% ; Get the active window's position, used for our calculations.

 TargetX := (A_ScreenWidth/2)-(Width/2) ; Calculate the horizontal target where we'll move the window.
 TargetY := (A_ScreenHeight/2)-(Height/2) ; Calculate the vertical placement of the window.
 
 WinMove, %ActiveWindowTitle%,, %TargetX%, %TargetY% ; Move the window to the calculated coordinates.
 
 Return