Thank you very much, @Slak_Jaw . I can see in this file that, for every pad mode button you press on the equipment, Djay Pro sets a specific pad mode too in the file. Example: turntable1.padModeInstantFX ; turntable2.padModeHotCue , etc.
So I guess it’s possible to make a 4 deck mapping similar to the one I did in Reloop Ready… Now I “only” have to buy a T7 to try it! 
Maybe when my budget is a but higher…
But thanks again!
You’re welcome @Carlos_Alexandre_Cam. Happy to help!
Teenage Engineering EP-136 K.O. Sidekick MIDI Map for Djay Pro
After initially using the Sidekick as just an audio mixer, I wanted to see if I could use it as an all in one “Minimum Viable” DJ controller. Turns out, with a bit of creativity, it makes a great little portable unit with basic transport controls, USB audio and pre-cueing.
Here’s a link to my mapping on DJTechTools - Let me know if you get some joy from using it 
https://maps.djtechtools.com/mappings/22527
To get it all working, first, configure the Sidekick for MIDI and USB Audio:
1. Go into the settings menu on the Sidekick by pressing the hidden button under the battery cover.
2. Use the orange pitch knob thing to move through the menu until you hit “MIDI”, then hit the Select button.
3. Use the pitch knob to move through the options until it says mode “Control” and hit Select.
4. Go up to USB and make sure the input is set to “Multi”. I also have Out turned on. Select to confirm.
5. Press the hidden button again to exit out of the settings menu. The screen should now say “Control” at the top.
On MacOS, copy the unzipped mapping file to: HDD>Users>Name>Music>djay>MIDI Mappings
On iPhoneOS/iPadOS, copy the unzipped mapping file to: On My iPhone/On My iPad>djay
In DJay Pro, go into Settings>Devices, and choose Mixer Mode: Internal.
Main Output: EP-136 - ch 1-2
Pre Cueing: EP-136 - ch 3-4
Alright, now to what it does…
It’s a two channel mixer with sound card, headphone cueing and basic transport controls.
The buttons, knobs and faders do the following:
GAIN: Moves through library.
GAIN PRESS: Load track to deck. Left is Deck 1, right is Deck 2.
SELECT + GAIN: Scrubs through track.
SELECT + GAIN PRESS: Jump to 2nd Hot Cue Position.
TREBLE, MID, BASS: Does what it says on the tin.
CUE: Turn headphone cue on and off for that deck.
SELECT + CUE: Pitch Bend. Left is -, right is +.
FADERS: Deck 1 and 2 Levels.
FX: Play/Pause Deck 1 and 2.
SELECT + FX: Select which Deck has focus for Pitch Bend and Loops.
BUTTON (Below Screen): Loop 16 Beats On/Off.
SELECT + BUTTON: Loop 32 Beats On/Off.
VOLUME: Master Volume Output.
ORANGE KNOB THING: Crossfader. Defaults to centre.
PHONES: Headphone Volume.
SELECT: Acts like Shift.
Nice! Thanks for sharing @Joshua_Murray
