Yamaha SY-77, Operating Manual

Page: 131 / 268

VOICE EDIT MODE
Algorithm Number (1...45): Select the algorithm
to determine the "arrangement" of the six
operators in an AFM element. Refer to the
following chart of the 45 algorithms. When you
change the Algorithm, the Src and Dst
settings explained below and the external input
settings explained in the following section will
be initialized.
FB1-FB3: Feedback can be drawn from three of
the operators in the algorithm and applied to any
operator that has an unused input.
Src 1-3 (OP1...OP6): Select the source of feed-
back for the three feedback routings. Any oper-
ator can be selected as the source of feedback.
(In some algorithms, one or more feedback
sources may be fixed by the choice of algorithm,
and cannot be changed. In such cases, an "F"
will be displayed after the Source (e.g., OP3F)
and the Destination operator explained in 0 will
be displayed in uppercase characters (e.g., IN1)
Dst OP1...OP6 (in1, in2): Select the destination
of each feedback source. Each feedback source
can be sent to as many destinations as you like.
Each operator has two inputs, and an operator
can be selected as a feedback destination only if
at least one of its inputs is free. It makes no
difference whether in1 or in2 is used, but
remember that the input levels of each operator
are set independently for in1 and in2. Refer to
the following section 1.3 Algorithm Input.
If both inputs of an operator are already used
by the algorithm connection, "-" will be dis-
played. If both inputs are already used because
of a feedback assignment, "use" will be dis-
played. If the algorithm has a fixed feedback
loop, the feedback destination operator will be
displayed in uppercase characters (e.g., IN1).
The cursor cannot be moved to the Dst setting
for such operators.
or the result of feedback routing has no influence on
the sound.
Note: If a carrier operator is used as a feedback
source, the amount of feedback will vary depend-
ing on the number of carriers, since carrier output
levels are automatically adjusted according to
the number of carriers.
Remarks: In previous Yamaha 6-operator FM
synthesizers, you had a choice of 32 algorithms
each of which included one feedback loop. The
SY77 provides broader possibilities with 45
algorithms, and three feedback loops that can be
sent to more than one operator. In addition,
operators can be modulated by external
waveforms.
1 1 9
Having three selectable feedback sources which can
be sent to any or all other operators allows you to
connect the operators in very complex ways. The
following diagrams show how the operators would
be connected for algorithm 40 when feedback
sources and destinations are set as shown in the
following table. Thin lines indicate the connections
defined by the algorithm, and heavy lines indicate
the feedback connections. Whether a connection
between two operators is the result of the algorithm