Programming Reset for MRC Sound Decoders

Some of the earlier Challengers had no total reset CV.
Later models do, set CV #125 to a value of 1. 
Otherwise it is a CV by CV reset for older models.

cv1=3 
cv2=0 
cv3=0 
cv4=0 
cv5=0 
cv17=0 
cv18=0 
cv19=0 
cv29=2

Make sure you do not have assigned an advanced 
consist number [cv19]. Make sure the plug between 
the loco and tender is firmly attached.