Yamaha TG500 Owner's Manual page 63

Active layers appear as upper-case characters and muted layers appear as
lower-case characters while the [UTILITY/SELECT] key is held. In the follow-
ing display, for example, layers "A" and "C" are active while layers "b" and
"d" are muted.
PFM LAYER SELECT é è
A:™61 b:Ñ41 C:Ö18 d:¡07
PERFORMANCE EDIT MODE
LAYER SELECTION & MUTING 51