Yamaha DX7 Product Manual - Page 37

Instea d

of taking the time to reprogram

th e envelope ,

we ask you to again

use

th e Voice Initialize feature.. .

it

save s time .

1.

To

gai n

acces s

to

th e

"Voice

Initialize "

function ,

pres s

[FUNCTION], and then [VOICE INIT], and answer

the displaye d

prompts .

2. Then press [YES] twice to initialize the edit memory

(buffer).

The display shows "EG RATE 2 = 99 " for two rea -

sons. First , th e programming

paramete r

displaye d is

whateve r paramete r

you had last adjusted .

In this

case, going back to Step 6 of the previous instructions,

you had set Rate 2 a t 50 , so "RATE 2" is diplayed . The

value , however

, is not 50, but is 99, since, as you

know , th e "initialized " envelop e

has all rates

a t 99 .

Play a note and you'll hear the DX7 is back to the

"square " envelope

.

3. No w pres s [OSCILLATOR-FREQUENCY COARSE ]

and operat e

th e [DATA ENTRY ] slide r and/o r but -

ton s while playin g a note . Watch

the display as you

listen to th e pitc h change .

Then use the slider and/or

these buttons while continuing

to play Middle C

32

CAUTION Don't turn

up the volume

too high

or hold a note very long at the higher fre-

quency

ratios

or you can easily

damage

the

high frequency

driver

(tweeter)

in your

speaker

system.

There's

nothing

"wrong"

with

the synthesizer

for "letting you" program

such

high frequencies.

The very high frequencies

are useful

at low levels

as part

of a voice,

or

for modulating

with other

frequencies in order

to produce

lower

frequencies that

are clearly

audible.

Unless

you're

programming

dog whis-

tles

or ultrasonic

alarm simulations,

you

won't

ever

use a ratio near

31.00 as a funda-

mental

pitch tor a carrier.

NOTE The pitches you

hear as you move the [DATA

ENTRY] slider constitute the Harmonic Series of the

note you are playing. When the diplay indicates "F

COARSE= 1.00" the "1.00" part is the frequency

ratio.

The "FCOARSE" part merely tells

you that the adjust-

ments you make will be coarse.

With the exception of

the "0.50" ratio, all COARSE

adjustments are

integer

multiples of the fundamental frequency

of the note.

That

is.

"1.00"

is

the fundamental,

"2.00"

is

2

times

the fundamental frequency

and so forth. If you play a

middle C, "1.00" is 262 Hz, "0.50" is 131 Hz (262 x

0.5), "2.00" is 524 Hz (2 x 262), and "31.00" is 8.122

Hz (31 x 262). The reason we

suggest

playing Middle

C is that if you play notes at the higher end of the

keyboard, by the time you increase to a ratio of

31.00, you will not be able to hear the pitch because

it will be above the range of human hearing. Speaker

performance

is also a factor at these

very high fre-

quencies.

If you play the A which is normally 440 Hz

when the ratio is "1.00" but change the ratio to

"31.00", the actual frequency

is 13,640 Hz. That is

near or beyond the point

where many

speaker

sys-

tems "roll off," so even if your ears are good, you may

have difficulty hearing it. Play an A one octave lower

and the frequency

is cut in half, so you'll have no

trouble hearing this same 31.00 ratio.

4. Adjust [DATA ENTRY] so the ratio is 1.00 again.

5. Now pres s

[OSCILLATOR-FREQUENC Y FINE ]

and operat e

th e [DATA ENTRY ] slider and/o r

button s

while playing

a note Watch the display

as

you listen

to th e pitc h change

.

Yamaha DX7 Product Manual - Page 37

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