MIDI Trigger: Control Change
The Control Change trigger is a MIDI-based input. It detects when a MIDI Control Change (CC) message is received from the specified MIDI device.
Control Changes are usually used by knobs, sliders or mod wheels on MIDI devices. They are ‘Continuous’ messages to provide the position of a knob or slider as it is adjusted in a range of 0-127.
Learn a bit more about MIDI Control Change data from the Introduction to Computer Music by Jeffrey Hass, Professor Emeritus, Jacobs School of Music, Indiana University.
Trigger Inputs
Channel
The MIDI channel of the MIDI Control Change message.
| Type | Whole Number (Integer) |
|---|---|
| Default Fallback | 0 |
| Min - Max Value | 0 - 15 |
| Required | No |
| Local Variable | Yes |
The MIDI channel values in Aitum are 0-15. Most MIDI software and hardware define MIDI channel values as 1-16. This is true for the channel values of both Notes and Control Changes.
This means that setting a channel to 0 in Aitum is equal to 1 in most other devices and software’s. The Aitum team intends to change the values internally to be 1-16 in a future update. (Update timeline TBD)
Control
The Control Number of the MIDI Control Change message.
| Type | Whole Number (Integer) |
|---|---|
| Default Fallback | 0 |
| Min - Max Value | 0 - 127 |
| Required | No |
| Local Variable | Yes |
Standard MIDI Control Change functions based on Control Number from MIDI.org
Value
The Value of the Control Change.
| Type | Whole Number (Integer) |
|---|---|
| Default Fallback | 0 |
| Min - Max Value | 0 - 127 |
| Required | No |
| Local Variable | Yes |
When it comes to ‘switch values’, older MIDI devices generally see anything above 0 as ‘ON’, or 0 as ‘OFF’ and 127 as ‘ON’ (Ignoring anything from 1-126). This has largely been replaced with 0-63 = ‘OFF’ and 64-127 = ‘ON’.
Hidden Variables
Hidden Variables are available as Local Variables within the actions of a rule, but you will not see these fields visually on the Trigger. These can also be used with a New Rule Check, more info here on Checks.
There are no hidden variables for this trigger type.