@replicat Step one imo would be to check if the driver in this round screen without touch (GC9A01): https://www.waveshare.com/product/1.28inch-lcd-module.htm
is similar enough to the driver in the screen for R2 (ST7789V2): https://www.waveshare.com/product/1.69inch-touch-lcd-module.htm
So that is work that sort of benefits more than one project when investing in screens.

Other than that it is sort of dependant on if I sent you the audio codec? Otherwise I would argue its smarter to aim at the R2 prototype instead of breadboard. Since all we need to figure out before making a first prototype board is:

1. CODEC Input/output.
2. SCREEN.
3. RGB Encoder.

And we have RGB encoder, LED slide potentiometer and the codec on the R2 prototype.

So basically if we can just check so the RGB encoder and codec works (and do a pinout for the screen to a RP2350) I am ready to make a first prototype and just skip the breadboard stage.

@AnalogWeapon The enclosure size in the image is 125B. I think we can pull it of with hammond 1590B which would make it preeetty slick imo. Will buy one and do some testing later with 3D printed fake pcb, hehe.

I think it will be really easy to 3D print something to hold the dome down against the screen that is screwed onto the PCB. The encoder is 7.8mm tall in its "body", so that minus how much the screen builds from the pcb is how far down the dome will go inside of the enclosure. Which is not that much at all, so thats perfect! Maybe just 2-3mm if even that. So just making a hole that is a bit smaller than the base of the dome should solve that.

The LED slider is same as the short one on RR1 btw. 20mm.

I'd just add more laundry terms and bump it up to proper multiFX beast. "Centrifuge" can be some vibrato/rotary effect.
Setting the washing "temperature" can be overdrive.
Setting washing "time" can be delay.
"försköljning" is pre-delay.

"Ironing" can be bitcrusher maybe or something.
"Bleach" can be pitchshifter.

so on and so fourth. And a way of choosing the order (signal chain) you do all them "laundry" steps just makes the signal all weird and crazy! Just like your clothes would become, hehe. So thats nice.

Johan knows.