Yamaha Vintage DX7 Special Edition ROM, Operation Manual

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Press this button (Don't
confuse it with [EG
LEVEL], button 22)
And repeatedly play notes until the display shows maxi-
mum output level
If you are familiar with analog synthesizers, you may
see a parallel between this sound and that of a saw-
tooth wave which is going through a filter that has a
lot of resonance. In fact you are frequency modulating
one sine wave with another sine wave; both are set to
the same frequency and the same level. There are no
filters involved.
Just to review the changes you
have made, notice that the
right hand stack (Operators 3
to 6) are turned off, while
Operator 2's output level is
now increased to 99.
5. Press the [OSCILLATOR-FREQUENCY COARSE]
button and play a note while slowly adjusting [DATA
ENTRY]. In fact play several notes at each frequency
setting, and observe the sound.
Then move this slider down
and gradually raise it or use
the [-1] and [ +1] buttons while
playing
Only the frequency should change in the display
From a minimum of 0.50 to a maximum of 31.00.
Listen to each ratio.
You are changing the entire harmonic structure of t h e
sound by changing the frequency of the modulator.
However, because the modulator output level is at
maximum, the bandwidth of the harmonics is great
(there are a lot of very high frequencies caused by a
lot of modulation). Musically, most of these sounds are
"extreme". You can achieve rather different sounding
results by simply reducing the amount ot modulation,
as demonstrated in the next step.
6. Press [OPERATOR-OUTPUT LEVEL] and thin
move the [DATA ENTRY] slider down to decrease
the level from 99 to 69 Then press [OSCILLATOR-
FREQUENCY COARSE] and again try playing notes
as you adjust the modulator frequency.
Make sure OP2 is current
And see this
Then move this slider
down slowly or press the
[-1] button
Until the display shows this output level
Then move this
slider upward slowly
This is the
modulator
which creates
the harmonics
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