Yamaha Electone EL-900 Owner's Manual page 121

4) FM O perat ors
T he O perat ors 1 t hrough 8 are t he si ne w ave O perat ors of t he al gori t hm .
W hen one of t hese O perat ors has been sel ect ed, t he fol l ow i ng param et ers are
di spl ayed:
1 O L (O ut put L evel )
D et erm i nes t he l evel of t he sel ect ed O perat orﾕs sound.
R ange: 0 - 127
2 A R (A t t ack R at e)
D et erm i nes how qui ckl y t he O perat or w i l l reach i t s m axi m um l evel
aft er t he key i s pl ayed. L ow er val ues produce a sl ow er at t ack.
R ange: 0 - 31
3 D 1R (D ecay 1 R at e)
D et erm i nes how m uch t i m e i t t akes for t he O perat or t o reach i t s
second l evel , set i n t he D ecay 1 L evel param et er.
R ange: 0 - 31
4 D 1L (D ecay 1 L evel )
D et erm i nes t he second l evel set t i ng of t he O perat or.
R ange: 0 - 63
5 D 2R (D ecay 2 R at e)
D et erm i nes how m uch t i m e i t t akes for t he O perat or t o reach i t s
t hi rd l evel , or t he m i ni m um l evel before t he key i s rel eased.
R ange: 0 - 31
6 R R (R el ease R at e)
D et erm i nes how m uch t i m e i t t akes for t he l evel t o reach 0 aft er t he
key i s rel eased.
R ange: 0 - 63
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N O T E :
W hen t he D 2R i s set t o 0, t he l evel set by
t he D 1L w i l l be m ai nt ai ned unt i l t he key
i s rel eased.
T he higher setting of the D 2R rapidly
l ow er t he l evel .
N O T E :
W ith the R R set too low , the sound
cont i nues t o sound.
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