Having all buttons black could either be an aesthetic decision or a way of keeping production cost down, I don’t know. But I agree it would be nice to be able to customise the button colours. Not only on the Synth.
The topic of custom keycaps was actually discussed recently. I think the TL;DR of that is:
- You probably won’t find any 3rd party keycap replacements, as they dimensions of the caps are tailored to the Polyend devices.
- Someone could probably model and 3D print new keycaps.
- There’s definitely a potential source of extra revenue for Polyend here, if they started selling replacement keycaps set in fancy new colours (Oooh! You got the exclusive golden buttons for your Tracker? Only 10 sets of those keycaps were ever made!)