User Manual

H9 User Guide HOTKNOB & Expression Pedal
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Expression Pedal
An external Expression Pedal can be connected to the rear panel ¼” stereo phone
jack labeled “EXP”. The Expression Pedal can be set up to control any combination
of parameters. For proper operation the Expression Pedal should be a simple
linear taper resistive potentiometer (“pot”) with a maximum value of between 5k
Ohms and 25k Ohms. Refer to www.eventide.com for information on
recommended expression pedals.
The H9 will auto-calibrate your Expression Pedal. To calibrate, plug the
Expression Pedal into the EXP jack and rock the pedal from full-heel to full-toe.
The Expression Pedal behaves identically to the HOTKNOB. They work in ‘parallel.’
The Expression Pedal’s action is set by patching the HOTKNOB. When using the
Expression Pedal the display works in the same way as if you were turning the
Knob in HOTKNOB mode. If a single parameter is assigned its value is displayed
when the Expression Pedal is moved. If the Expression Pedal has been set up to
control multiple parameters, the display is simply a range from 0-99. To indicate
which X, Y, Z parameters are controlled by the Expression Pedal, Press and Hold
HOTKNOB and an X, Y, or Z button and turn the Knob.
The HOTKNOB/Expression Pedal settings are not saved automatically. If you want
to be able to recall your settings, you must perform the Preset Save operation.
Note: The Expression Pedal input supports control voltage inputs from 0V to 3V.
Care must be taken to avoid ground loops when using this input with external
control voltages. If you hear a “hum” only when you’ve connected a control
voltage source to the H9’s Expression Pedal input jack, then it is likely that the
device generating the control voltage is grounded to a different ground than your
audio inputs and outputs. Ground loops are notoriously difficult to track down
and beyond the scope of this User Guide to diagnose.