Channel label names

When using the Lay instruction, the following channel labels can be used:

FL	Front left
FR	Front right
FC	Front center
LFE	Low frequency
BL	Back left
BR	Back right
FLC	Front left-of-center
FRC	Front right-of-center
BC	Back center
SL	Side left
SR	Side right
TC	Top center
TFL	Top front left
TFC	Top front center
TFR	Top front right
TBL	Top back left
TBC	Top back center
TBR	Top back right
WL	Wide left
WR	Wide right
SDL	Surround direct left
SDR	Surround direct right
LFE2	Low frequency 2
TSL	Top side left
TSR	Top side right
BFC	Bottom front center
BFL	Bottom front left
BFR	Bottom front right

Using other channel labels may work but is not supported.