This module provides an input point for external instruments to your modular system. It can be used with guitar, bass, keyboards or other audio. It requires no special parts to build. The PCB has MOTM and Eurorack style power connecters.
For complete descriptions of the way the module is used, with patch ideas and MP3 demos and how to build it, download this PDF file.
Boards are available now. Price for 1 board is $8.
Unfinished eurorack panels are available for this project. They are 12HP and cost $8 each. There's more information about them here. The layout is the same as the one pictured to the left.
If you'd like to drill your own panel, feel free to use my drilling guide, it should be printed at 300dpi to scale correctly.