Casio WK 3700 Accomp volume

The "accomp volume" always starts out at it's default level of 100 which is too loud for my liking. Does anyone know if there is a way of changing that default level.....like to say 60 or so??

When you turn on the WK press the ACCOMP VOLUME button then on the nubmer pad press the no/- button to decrease the volume.