Yamaha DX27 Owner's Manual page 45

Set OP3 (carrier) EG
STEP 8:
Before we actually set the OP3 EG parameters, select OP3 using the OPERATOR
SELECT button, call the OPERATOR OUTPUT LEVEL parameter and set it to 99.
Now enter the following EG parameters:
AR = 31
DIR = 13
D1L = 0
D2R = 0
RR = 10
Copy OP3 (carrier) EG Parameters to OP4 (modulator)
STEP 9:
Hold down the EG COPY button and press the OPERATOR/AMS ON-OFF 4 button.
Raise OP4 (modulator) Output Level
STEP 10:
Select OP4, select the OPERATOR OUTPUT LEVEL parameter and set it to 71.
Set OP4 Frequency Ratio
STEP 11:
To get a metallic attack "ping," we'll set the OP4 output level frequence ratio to
7.00. With OP4 selected, press the OSCILLATOR FREQ RATIO button and set to
7.00.
Play a note and listen to the attack sound.
Combine all Operators and Balance Levels
STEP 12:
Turn OP1 and OP2 back on so we can here the combined sound of the two operator
stacks. Play a note. At this point the attack sound is far too loud, so we'll reduce
the output level of OP3 to achieve a better balance.
Select OP3, press the OPERATOR OUTPUT LEVEL button and set to 70.
Play a note—our piano voice is improving.
Set Feedback Level
STEP 13:
We can enhance the attack sound of the voice by adding just a touch of "bite"
using feedback. Select the FEEDBACK parameter and set to 5.
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