simplemente descomentando el renglon que quieras usar saca sonido por ese canal...mides y equalizas.
pr ej
#Copy: SUB=L L=0.0 R=0.0 C=0.0 RL=0.0 RR=0.0

#Copy: SUB=0.0 L=L R=0.0 C=0.0 RL=0.0 RR=0.0
#Copy: SUB=0.0 L=0.0 R=L C=0.0 RL=0.0 RR=0.0
Copy: SUB=0.0 L=0.0 R=0.0 C=L RL=0.0 RR=0.0.............al quitarle #....activas el canal central y el sonido saldra por aqui
#Copy: SUB=0.0 L=0.0 R=0.0 C=0.0 RL=L RR=0.0
#Copy: SUB=0.0 L=0.0 R=0.0 C=0.0 RL=0.0 RR=L


asi con cada canal.