Wampy is an interface addon for modern Linux-based Walkmans, which allows you to switch between standard interface and custom one using hardware Hold switch.

The project was born out of handful of standard UI nitpicks and "can I make a prettier UI?". There is no Rockbox port for my device (NW-A55), so I did a UI myself, unlocking and adding various features along the way, such as:

  - Winamp 2 skin support
  - Custom cassette skins
  - Digital clock skin ported from iPod Nano 7g
  - Audio amplification table editor for S-Master HX
  - All audio filters are available regardless of firmware
  - Per-song audio filter options
  - Standard interface enhancements (add clock and increase cover art size)
  - Low latency USB DAC module
  - FM radio on devices with FM chip and Walkman One (A40/50)

The result covers 6 models, from cheapest NW-A30 to premium NW-WM1Z. Development process involved a lot of reverse engineering, digging into device internals and was pretty fun overall; there are links to development stories in README.md, describing how this or that feature was added.