Boss PS-5 Owner's Manual page 26

Using the EXP jack
Connecting an expression pedal (Roland
EV-5; sold separately) allows you to use
pedal action for continuous control of the
pitch shift.
1. Referring to "Connections" (page 11–
13), connect the PS-5 to another
instrument.
2. Set the EV-5's minimum volume to
the lowest value (0) on the PS-5.
* Failure to set the minimum volume properly
will alter the degree of pitch shift, which can
cause the PS-5 to function improperly.
3. Press the pedal switch to the
forward position; then set the
degree of pitch shift with the
PITCH switch.
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* The degree of shift adjusted with the
PITCH switch differs depending on the
MODE switch setting. Refer to
"Description of Each Mode" (page 14–25).
4. When the EV-5 is returned to
the original position, the
sound is output with no
change in pitch.
In PITCH SHIFTER/HARMONIST
modes, use the EV-5 to change the
pitch while you perform.
In DETUNE/T.ARM/FLUTTER
modes, the pedal is convenient
for changing pitch settings.