[Mitch]

To change SMX settings, follow this procedure:

- power off
- remove the jumper on SMX A-B-C (remember the correct setting)
- power on radio and SMX, and wait for a short "air pressure" sound

There are now 5 settings, each with 4 options. Use the "truck horn" switch of your radio to change options, and the "engine start" switch of your radio to move on to the next setting. You just have to listen to the SMX, it plays each sound option, the current setting and every change. You can change the options as often as you like.

Just play with it.

Settings and options are:

1. Volume of the "air pressure" sounds, 4 options - lowest volume means off, no sound at all (For example, wheel loaders don't have a air pressure brake, so you might want to turn this off)
2. Volume of the "back up" sound, 4 options - lowest volume means off, no sound at all
3. Type and volume of the "switch gear" sounds, 4 options (S20 don't support this. But M20+ does)
4. Volume of the "turbo charger" sound, 4 options - lowest volume means off, no sound at all
5. Truck horns, 4 options - choose the horn you like best

After step 5 choosing the horn, use the "engine start" switch again. The SMX will now play the german firefighter sound and save your settings. If you remove power before that, changes will not be saved. So when you are confused - switch power off and start again.

When everything is OK and saved, remove power and re-insert the jumper on A-B or B-C.