The recommended setting is Relative #1 for all knobs with Knob Acceleration set to Slow (Off) or Medium. Individual rotors can be configured to send absolute (0-127) values or changes (+/- 1,2,3,… in different encodings). If the drop-down has many (more than 13) items (like the blending mode drop-down), the rotor will go around twice the first time with one light on, and the second time with two adjacent lights. If linked to a drop-down (or star rating) the rotor will step one light at the time. The light rings around the rotors show a different pattern depending on whether the associated slider has a symmetrical +/- range centered around 0, 0-100 (or 0-1) or anything else. Layers A & B are somewhat supported, however, since the device does not send a notification when switching between layers, and since the updates to “hidden” rotors and lights (both under buttons and the pattern used around the rotors) are ignored, everything will only be updated completely after you press or turn something in the “new” layer. The device should be in Standard Mode (not MC). Alternatively you could read or respond to any of the (closed) midi or “inputng” issues or pull requests in the main darktable repository if you need additional help or guidance yourself. You could do this either by submitting a documentation pull request to amend this page or by filing an issue containing the necessary information. If you succeed in getting a midi device up and running that hasn’t been mentioned below, it would be greatly appreciated if you would provide feedback in order to assist others, if any special steps are required. A configuration framework (possibly in lua) to support additional device-specific features is on the to do list. All other devices are treated as “generic midi” and may or may not work (well) or need some manual setup each time. The shortcut mapping system has been most extensively tested with the Behringer X-Touch Mini and contains custom code to deal with the specific features of this device.

Darktable github