I love easter eggs, so I just summarized all found and still unknown easter eggs. Read it on your own risks! It can spoil you. I will update, if new stuff is found/released.
It’s a hidden oscillator model that plays morse code.
To get the mode as an additional oscillator mode you need to enter 49 in the built in text editor. It can be found on one of the last pages of the Braids settings. Here is the initial text:
GREETINGS FROM MUTABLE INSTRUMENTS * EDIT ME*
Change it to: 49
Now the new oscillator model is available in the list of oscillator models.
It’s a hidden mode, which turns the module into a weird 2x2 operators FM synth voice. Think Braids’ FM/FBFM times two. It lives in a strange middle-ground between classic subtractive analog and what you’d expect of FM.
Set all the attenuverters and all the TIMBRE knobs of the Exciter section to their minimum position. Set all the attenuverters and the DAMPING, POSITION, and SPACE knobs of the Resonator section to their maximum position.
Hold the PLAY push-button for 5 seconds. Press PLAY again. The push-button’s built-in LED should be off. You can now move the attenuverters and other knobs to their normal position.
More info here
Three long presses on both the SPLIT and FUNCTION buttons starts a “number station”. The pots are controlling pitch, transition probability, noise and distortion.
There is also a fifth mode in the source code: Bouncing ball. A hidden mode for hackers and programmers
Streams has a hidden lorenz attractor. To activate it, press this sequence 4 times: "Channel 1 button. Channel 2 button. Channel 1 button (long press). Channel 2 button (long press)."
SHAPE controls the rate (value of the time step) and is CV-controlled by EXCITE. AMOUNT controls whether amplitude or cutoff frequency are modulated.
You can use it to make a CV/audio signal “wobble”, or when nothing is patched into the input, you get a random source. It’s a very pleasing smooth modulation source!
A hidden Plotter drawing mode. It draws a plotter that can be edited in the source code (plotter_program.h).
To enter: Add a cable to the FM and Level Input. Now press the top (mode) button 1 second. All leds light yellow. Press it again for one second. All leds light green. Now press the button bellow (the range button) and all LEDs should light red.
You have now entered the plotter mode. To see the plotter, best use a oscilloscope like the “Jones O’Tool Oscilloscope module”.
The hidden mode plays a song that can be edited in the source code (song.h).
To enter set the Clock Tempo and Clock Swing both to 49. Set the Clock Output Devision to 3 and the Clock Bar Duration to 9.
Now press the Start/stop button without being in any mode.
No hidden easter eggs in Branches, Clouds, CVPal, Edges & Grids.
Links, Ripples, Shades & Shelves don’t have any easter eggs. They are analog and without micro controller.