External Control Of 12 Step; Controlling 12 Step Leds; Controlling 12 Step Display - Keith McMillen Instruments 12 Step Reference Manual

4.4 External Control Of 12 Step

The 12 Step can control a wide variety of MIDI software and hardware, but it can also be controlled
from an external source via USB

4.4.1 Controlling 12 Step LEDs

The 12 Step's LEDs can be controlled from an external software or hardware source using CC
messages. Each key has an accompanying red LED that responds to the following messages:
CCs 20-33 control the LEDs on the 12 Step keys (one CC per key).
CCs accompanied with a value of:
• 0 = LED Off
• 1 = LED On
Note: When sending MIDI to the 12 Step via USB, CCs should be sent to 12 Step Port 1.

4.4.2 Controlling 12 Step Display

In addition to the key LEDs, the four-character display on the 12 Step can also be controlled via
external software or hardware using CC messages.
The four characters on the display are addressed using four CC messages:
• CC 50 = first character
• CC 51 = second character
• CC 52 = third character
• CC 53 = fourth character
Each CC should be sent with a value between 48 and 90. These values correspond to the
following:
• 48-57 = Numbers 0-9
• 65-90 = Letters A-Z
• 58-64 = various symbols/characters (or blank spaces)
So, for example, to make the third character on the display show the number "3", send CC 52 with a
value of 51.
Note: When sending MIDI to the 12 Step via USB, CCs should be sent to 12 Step Port 1.
or MIDI Expander.
Appendix 46