Hi AJ,
Thank you for noticing my problem.I am using a REGISTRATION
especially for manually using the keyboard.I use registrations for normal playing as well and that is not affected.Its just when playing manually if I have to change a volume on one of the lowers through the arranger view (you cannot do it any other way)The lower volume can go silent completely and the only way to get it back is to change the registration or turn off the keyboard and turn it back on again.The bass line is not affected at all just the two lowers.Touching the Balance button has also muted them but not always.I have to be careful not to touch it after setting it up now and leave it alone.This is not always satisfactory though.