CTL2 – Joystick / Touch
The CTL2 can be seen as a versatile modulation hub for the system. The Joystick and Touch sections
of the CTL2 are independent, but complimentary and are individually explained below.
Joystick Section:
The X and Y axes behave in identical manner, both dependent on the setting of the two switches per
section:
Ext(ernal) / Int(ernal)
– selects whether the Joystick controls the level of an external signal or uses an
internally generated voltage reference for variable DC output.
Uni(polar) / Bi(polar)
– the response depends on the Ext / Int setting – examples are given below along
with a response diagram.
EXTERNAL – UNIPOLAR: The joystick controls the level of the external signal from zero at fully left to
unity gain at fully right.
EXTERNAL – BIPOLAR: The joystick controls the phase and level of the external signal. Fully left the
signal is inverted with unity gain, in the middle the signal is fully attenuated and fully right the signal
passes non-inverted with unity gain.
INTERNAL – UNIPOLAR:The joystick generates a DC output voltage rising from zero volts at fully left
to +10 volts at fully right.
INTERNAL – BIPOLAR: The joystick generates a DC output voltage rising from -5 volts at fully left,
through zero volts at centre and +5 volts at fully right.
Each axis has a bi-colour LED with green indicating positive voltage output and red indicating negative
voltage output. The control shaft of the Joystick is a custom spun aluminium piece 35mm long and
removeable via a standard M3 thread at the base.
Touch Section:
The two Touch Plates generate DC output voltages dependent on physical touch with a maximum
output voltage of +10 volts and an LED indicator. The Gate signal goes high to +10 volts whenever the
corresponding plate is touched.
The sensitivity of response can be adjusted to suit the user by adjusting the trimmer at the top-left of the
rear PCB. While the two plates are independent, pressing both at the same time can cause interaction
– you should view the plates as monophonic (one at a time).
