Doepfer CTM64 Contact to Midi Interface (main board) Manual de usuario descargar pdf (Pagina 16)

Another pin header labelled JP8 is located right to the main processor. The jumper installed to JP8 has

this meaning:

Normal / Toggle operation

• Jumper installed in upper position (GND, towards the XTAL): normal mode (factory setting)

• Jumper installed in lower position (+5V) toggle mode

When the toggle mode is selected the CTM64 transmits alternately note on and note off at each closing

of the contact (opening the contact has no meaning in this mode). This can be used to realize a toggle

switch e.g. in Ableton Live).

Control Change mode

When two resistors are installed to JP8 instead of a jumper the control change mode can be selected.

In this mode the CTM64 transmits Midi control change messages instead of note or program change

messages. The resistors work as a voltage divider and generate certain voltages that are used by the

CTM64 firmware to select the control change mode:

• 10KOhm from center pin to GND / 20kOhm from center pin to +5V: Control change mode normal

• 10KOhm from center pin to +5V / 20kOhm from center pin to GND: Control change mode toggle

For the control change messages the same parameters as for the note messages are taken (i.e. the

note number corresponds to the control change number).

Remark: The state of JP8 is checked only once during power on. It is not possible to change the

operation modes defined by JP8 during operation !

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Doepfer CTM64 Contact to Midi Interface (main board) Manual de usuario Pagina 16

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