Yamaha SY55 Product Manual page 67

when the "nrm" mode has been selected, but
"HT (Hold Time) will appear instead when the
"hld" mode is selected.
The arrow symbols ( and )that appear at
either end of the display mean that more para-
meters can be accessed by moving the cursor in
the indicated direction using the
keys.
Details:
The "nrm" and "hld" mode settings affect the
initial attack of the sound, determining how the
amplitude envelope begins. In the "nrm" mode,
the envelope begins from zero level, reaching
the maximum AWM level at a rate determined
by the R1 (Rate 1) parameter. In this mode there
will always be a slight delay between the initia-
tion of a note and maximum level. The follow-
ing two diagrams show the kind of envelopes
that can be produced in the "nrm" mode.
The envelop begins at zero level, reaches
maximum level at the rate determined by the Rl
parameter, moves to L2 (Level 2) at R2 (Rate 2),
moves on to L3 (Level 3) at R3 (Rate 3), and
finally decays to zero level at R4 (Rate 4) if the
note is held the entire time.
If the note is released before the end of the
envelope described above, then the sound de-
cays to zero level from the point at which the
note is released at the rate determined by the RR
(Release Rate) parameter.
If the "hld" mode is selected, the envelope
begins immediately from maximum AWM level,
allowing the fast attack transients of waveforms
to pass unaffected. In this case the R1 parameter
is replaced by the HT (Hold Time) parameter.
The HT parameter determines the length of time
and between the beginning of the envelope and the
point at which the envelope begins to move to-
wards L2 (Level 2) at R2 (Rate 2), as shown
below.
For the level parameters, a setting of "0"
corresponds to the lowest possible level (no
sound) while a setting of "63" produces the high-
est output level. A "0" rate parameter setting
produces the slowest rate between levels, while
the maximum setting of "63" produces the fast-
est (almost instantaneous) change.
Refer to: Tutorial, page 36, 44.
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