I’ve been exploring a design approach I call Grey Space Reduction (GSR), aimed at reducing unnecessary hesitation, visual ambiguity and mental workload when operating DJ controllers.
What is Grey Space?
It’s the moment between looking at a control and understanding exactly what it means.
For example, when a button has several illumination states—off, outlined, glowing or solid—does every state communicate something useful, or does it introduce unnecessary interpretation?
My objective is straightforward:
Remove unnecessary uncertainty without removing useful information.
A practical example — Reloop Mixtour Pro
While refining my controller’s transport-button illumination through djay Pro’s MIDI mapping editor, I discovered that certain MIDI Out values produced different lighting states:
- 0: LED off.
- 2: Blue outline.
- 6: Solid blue.
For Sync and Loop, I changed the minimum MIDI Out value from 2 to 0, retaining the maximum value of 6.
This eliminated the unnecessary outline state, leaving a clear indication of whether the function was active or inactive.
However, I deliberately retained the blue outline on the Cue button because it provides useful secondary confirmation of the selected deck layer.
The Play button remains solidly illuminated for deck identification, while playback movement is confirmed by the waveforms on my iPad.
The important distinction is that GSR isn’t about removing every illuminated state. It’s about ensuring every state serves a purpose.
Hardware and software working together
This improvement required no physical hardware modifications.
It demonstrates how relatively small changes to MIDI mapping can improve the usability of existing DJ controllers.
I recently discussed these principles with another community member experiencing four-deck selection confusion on a DDJ-XP2.
They successfully adapted the colour-identification approach to their controller and reported fewer mistakes and reduced mental effort.
You can follow that discussion, including my detailed MIDI mapping example, here:
DDJ-XP2 with four decks is confusing — Algoriddim Community
I’m interested in hearing whether other DJs have encountered similar ambiguity with controller illumination, deck selection or operating layers.
The broader question is:
How much unnecessary thinking can we remove from operating DJ equipment without sacrificing functionality?
Less interpreting. Less hesitating. More performing.
Rick Vincent
