How do you lower the master volume on a sound value gp40 using an mrc tech6?
From the Tech 6 Manual:
ADJUSTING CVs (Configuration Variables)
If you are an advanced user, you may wish to adjust the decoder CVs. Refer to your
See locomotive or decoder manual for information on CV definitions and their values.
To adjust CVs:
1. Press P; all LEDs will turn on.
2. Input the CV number to adjust and then press ENTER; all LEDs will turn off.
3. Input the CV value.
4. Finish the process by pressing ENTER again. Two LEDs will light showing the
Tech 6 has reverted to DUAL mode and ready to resume running.
To adjust another CV, repeat the above 4 steps.
Len