Classic Organ Works CMK-2, User Manual

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CLASSIC MIDI KEYBOARD
CMK-2-1
CMK-2 HARDWARE CONFIGURATION
Introduction
The CMK-2 is customizable to suit many organ applications. Up to three CMK-2 keyboards may be stacked level or
tilted if the optional mounting brackets are purchased. Each keyboard has 61-keys which serve programming purposes
as well as musical purposes. Two useable analog inputs are available (for volume/expression and crescendo
adjustment. The third input is not useable at this time).
Power-On Self Test
The CMK-2 has a built-in self test that executes upon power up.
Analog Input Pins
There are three analog inputs on the CMK-2 Keyboard. Only two are useable at this time. (see Fig 13) Input 1 is for a
standard swell-shoe and input 2 is for an ahlborn archive crescendo pedal . Analog devices must be connected to the
analog input pin, a positive voltage (+5V) on pin ‘1’, and ground potential (0V) on pin ‘3’. Depending on the position
of the analog device, a unique voltage will be read by the processor which will determine the setting. In the case of a
volume control, the position of the analog device will determine the loudness level. See Figure 13.
MIDI Crescendo – only for Ahlborn Archive modules
MIDI messages are sent to gradually add stops to a registration. ‘Analog Input 2’ is used for Crescendo.
MIDI Volume
A MIDI controller 7 message is sent to change the loudness level of the stop or sound. The MIDI volume analog input
must be configured to transmit on one or more MIDI channels as outlined in Table 8.
MIDI Expression
A MIDI controller 11 message is sent to set the loudness level within the preset volume range. ‘Analog Input 1’ is
used for Expression but can also be used for Volume. Expression messages adjust the loudness within a range not
exceeding the maximum set by volume. The MIDI Expression analog input must be configured to transmit on one or
more MIDI channels as outlined in Table 8. In multi-manual CMK-2 setups, the range for the Expression control can
be set by attaching a Volume control to one of the keyboards and attaching an Expression control to another keyboard.
If the volume and expression controls are set to produce messages on the same MIDI channels, the volume control will
set the maximum range while the expression control will change the loudness level in the volume range.