Filter: Cutoff Envelope Generator - Yamaha SY55 Product Manual

Mode
Summary: Determines whether the cutoff frequency
of the selected filter will be controlled by the
LFO or by the filter envelope generator (EG).
Settings: EG, LFO, EGVA
Procedure: Use the
select the Mode parameter. Use the [DATA EN-
TRY] control or [+1/YES] and [-1/NO] keys to
select the "EG" or "LFO" setting.
Filter 1 or Filter 2 can be selected by holding
the [SELECT] key and pressing the numeric [9]
or [6] key, respectively.
Details: Varying the filter cutoff frequency can
ceate "sweep" or "wah-wah" type effects. If the
cutoff is controlled via the LFO a cyclic vari-
ation based on the "shape" of the selected LFO
Summary: All parameters within this function de-
termine the "shape" of the cutoff envelope gen-
erator for the selected filler. This function is
only available if the "Mode" parameter (page
63) is set to "EG" or "EGVA."
Settings:
L0, L1, L2, L3, L4, RL1 and RL2 parameters:
-64 ... +63
R1, R2, R3, R4, RR1 and RR2 parameters:
0 ... 63
Procedure: Use the
select the various rate and level parameters in
turn (L0, R1, L1, R2, L2, R3, L3, R4, L4, RR1,
RL1, RR and RL2), using the [DATA ENTRY]
control, [-1/NO] and [+1/YES] keys, or numeric
and [ENTER] keys to set the value of each.
The arrow symbols (
either end of the display mean that more para-
and cursor keys to

FILTER: CUTOFF ENVELOPE GENERATOR

and cursor keys to
and ) that appear at
waveform is produced. If EG control is selected,
the filter envelope generator (a separate EG is
provided for each filter — see "FILTER: CUT-
OFF ENVELOPE GENERATOR" below) can be
set up to produce a wide range of time-based
variations.
Please note that if "LFO" is selected, the
filter cutoff envelope generator parameters have
no effect on the sound and will not appear on the
display: Cutoff EG levels and rates, rate scaling,
and level scaling. The filter can only be con-
trolled from controllers (modulation wheel, etc.)
if the LFO mode is selected.
If the "EGVA" setting is selected, the R1
and L1 envelope parameters arc controlled by
note velocity (i.e. the harder a key is played the
higher the Rl speed and L1 level). All EG para-
meters are controlled by note velocity when
"EG" is selected.
Refer to: Tutorial, page 37, 45. "FILTER: CUTOFF
ENVELOPE GENERATOR," below.
meters can be accessed by moving the cursor in
the indicated direction using the
keys.
The filter 1 or filter 2 envelope generator
can be selected by holding the [SELECT] key
and pressing the numeric [9] or [6] key, respec-
tively.
Details: The cutoff envelope generator level para-
meters correspond to cutoff frequency. Plus "+"
values produce higher cutoff frequencies while
minus "-" values produce lower cutoff frequen-
cies. "0" level values produce the normal cutoff
frequency as determeined by the cutoff parame-
ter (See "Cutoff" on page 74).
The "Rate" parameters work in the same way
as the amplitude, and pilch envelope generator
rate parameters: a selling of "0" produces the
slowest rate between levels, while the maximum
setting of "63" produces the fastest (almost in-
stantaneous) change.
The pilch envelope begins at L0 (Level 0),
moves to L1 (Level 1) at a rate determined by
the selling of R1, then to L2 (Level 2) at R2
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