Yamaha DX21 - Manual (Page 13)

(2) “Fingered Porta” (MONO mode only): Portamento only occurs if the previously
played note is held while the next note is played. This mode is useful in re-
creating the effect of guitar string bending techniques, wood bass slide effects,
etc. If you lift your hand off the DX21 keyboard between notes, there will be
no portamento effect.
Once the PORTAMENTO MODE function is called, subsequent presses on the
B3 button alternate between the two available portamento modes only if the MONO
note output mode is selected. The DATA ENTRY switches can also be used to
select the desired portamento mode.
B4: PORTAMENTO TIME
This function sets the speed of the portamento effect.
The data range is from 0 to 99. At 0 portamento is off. A setting of 99 produces
the longest portamento effect.
Data can be entered using the DATA ENTRY control and -1/+1 switches. Once
the PORTAMENTO TIME function has been called, subsequent presses on the
B4 button increment the data value.
B5: PORTAMENTO FOOT SWITCH
This function turns the rear-panel PORTAMENTO footswitch jack ON or OFF.
When OFF the PORTAMENTO footswitch will NOT function. When ON the
PORTAMENTO footswitch connected to the PORTAMENTO jack can be used to
turn the portamento effect ON or OFF. (accepts Yamaha FC-4 or FC-5 foot
switches)
Once the PORTAMENTO FOOT SW function has been called, subsequent presses
on the B5 button alternate between the ON and OFF settings. The DATA ENTRY
switches can also be used to turn this function ON and OFF.
B6: FOOT CONTROL VOLUME
This function sets the control range of a foot volume controller (Yamaha FC-7,
optional) connected to the rear-panel VOLUME jack.
The data range is from 0 to 99. At 0 the foot controller is OFF and will have no
effect on the sound. At 99 the foot controller can be used to adjust output volume
over the full range from maximum volume to zero volume. Intermediate settings
permit corresponding degrees of “expression” or “swell” control.
The DATA ENTRY control and -1/+1 switches can be used to enter the data for
this function. Once the FOOT CONTROL VOLUME function is called, subsequent
presses on the B6 button increment the data value.
B7: FOOT CONTROL SUSTAIN
This function turns the sustain footswitch (Yamaha FC-4 or FC-5, optional)
connected to the rear-panel SUSTAIN jack ON or OFF. When ON the sustain pedal
can be used to control the sustain effect. When OFF the sustain pedal will not
function.
Once this function is called subsequent presses on the B7 button alternate between
the ON and OFF states. The DATA ENTRY switches can also be used to select the
desired mode.
B8: WHEEL RANGE (MODULATION WHEEL), PITCH
As you move the DX21 modulation wheel away from you an increasing amount
of LFO (Low Frequency Oscillator) modulation is applied to the selected voice.
LFO modulation can be made to modulate the pitch of the voice producing a range
of vibrato type effects. This function is used to set the maximum depth of pitch
modulation which can be applied using the modulation wheel. The actual effect
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