Share any of your even most bizarre ideas on which module we should bring to life together!
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Here is some random white-noise on the topic:
Alarm clock CV module.
Like you set it up, and wake up from the wonderful screams of your modular music.
Some kind of internet-controlled CV, so people online can randomly mess with your knobs. (Basically, yet another esp32 module application)
Fisheye Camera module to have an ugly POV from the microrack’s viewpoint, just for lulz
Unnecessary media - magnetic card reader, punch tape reader, qr code reader, nfc reader.
Analog sensor module. There are 3 main types to my guess - voltage, resistance, and capacity. For sure each resistance sensor can be converted to voltage, but if there was a module that supports all three types directly, it could be connected to a lot of-the-shelf sensors from different arduino kits and more in seconds.
Some stuff for math operations - sum/subtract/ xor/or/and/not offset/invert, or something like that.
Noisebox (stuff with springs) (https://youtu.be/2G6vBK7lk7Y)
Laser harp, yay.
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Theremin — two antenna inputs, two CV outputs.
or just have an open reader head, and you can drag cards across it, but also lengths of audio tape or video tape or whatever. Bonus points for write mode.
I wonder if a mini punk spring reverb is feasible. Could double as a noisebox.
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Module which translate synthesised sound into vibrations (some skin attachments or bracelets is needed/or even shirt!) and give an opportunity for deaf people to play and discover the sound with microrack
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Module with a touchpad to control 2 outputs by the x/y position of the stylus or finger
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Ping sensor module to convert distance (of say a moving hand) to cv.
Some sort of a cv recorder/looper for recording/playback of cv automation
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Turing Machine stochastic sequencer, similar to Music Thing Modular, but based on ESP32 or Atmega chip for schematic simplicity.
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Polyphonic Digital Synth module using an RP2040 or similar microcontroller. PWM audio out for a bit more analog feels. I have tried making one out of Circuitpython synthio but maybe implementing it in C would be a better idea
This will be a wild one, but if we have a polyphonic signal source such as the Polyphonic Digital Synth, then we can use a more powerful micrcontroller like an ESP32-S3 as a vocoder. I’m also researching into this but I probably will only be able to implement it in Circuitpython 
How about a module that forces some musical scale?
Like it quantizes voltage to the nearest note voltage from scale. (Like “C Harmonic Minor” or “E Phrygian”
From stylus input it would just play notes only from the scale, with LFO input it would arpegiate in that scale, etc.
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Also, maybe stylophone beat - style board?
Probably it shoud be able of per-pad signal output, so it could trigger different chains, I mean that with this type of input it should be possible to generate drum-like sounds, so probably it should be routed through different VCO’s , to make “bass drum” “hats” etc separately.
(Actually I do not know how drum-like sounds are usually made in modular systems, so I am guessing here, but most probably making just a stylus keyboard as the one that already exists in a different form factor is not enough to get the best of it). And it could have more than one stylus actually.
inductive distance sensor module to get a setup similar to a theremin
What about an analog spring reverb module that can be controlled with an LFO or any other signal to add ambience and atmosphere to the sound without the need for digital effects?
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It is kind of fantastic one, but imagine an oscilator module where you can draw a waveform on the small touchscreen.
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I think it is possible if we can found touchscreen that can fit into microrack dimensions