Mame and xbox controllers

[Multimike]

Is there a way to make mame use the same numbers for my Xbox controllers everytime I boot up my pc??  Right now I’m using the ctrlr file to make my guns work everytime is there a line of code I could add to that so the numbers stay the same? Like right now if I set them up and then restart my pc the joy number will change from let’s say number 1 to 3 or 4. It’s super annoying. Any help here would be awesome. Thanks 

[Headrush69]

You can use MAME stable controller IDs to help with the issue: MAME stable controller IDs

One problem is the IDs between the same Xbox controllers aren't unique (unless the situation has improved), so you could set up 2 xbox controller to specific IDs, but you can't make sure a specific xbox controller is the first or second xbox controller .

For example you can map 2 xbox controller to MAME joystick 7 and one to MAME joystick 8. Which ever one is scanned or attached first will be assigned to MAME joystick 7 and the next one as MAME joystick 8. So within MAME you can map controls to joystick 7 and 8 for  player 1 and player 2, but you don't know for sure which Xbox controller will be which.