Cmk Hardware Configuration; Introduction; Power-On Self Test; Analog Input Pins - Classic Organ Works CMK-1 User Manual

CLASSIC MIDI KEYBOARD
CMK-1

CMK HARDWARE CONFIGURATION

Introduction

The CMK is customizable to suit many organ applications. Up to three CMK 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 analog inputs are available (for volume/expression and crescendo adjustment).

Power-On Self Test

The CMK has a built-in self test that executes upon power up. This power-on self test serves to detect the presence of
hardware for velocity sensing. The test also checks that all 61 key-switch contacts are functioning properly. If
hardware is not present or is malfunctioning, velocity sensing is automatically disabled. The user can also disable
velocity sensing manually by pressing any keyboard key before connecting power.

Analog Input Pins

There are two analog inputs which can be configured for volume/expression and crescendo. 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

A MIDI program change message is sent to gradually add stops to a registration. 'Analog Input 1' is used for
Crescendo.

MIDI Volume

A MIDI program change 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 11. 'Analog input 2' is used
for Volume but can also be used for Expression.

MIDI Expression

A MIDI program change message is sent to set the loudness level within the preset volume range. 'Analog Input 2' 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 11. In multi-manual CMK 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.
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CMK-1 Manual (Issue-1) October 20, 2004