This little board contains a 12V DPDT relay, to switch between audio channels (lead and clean, for example) on a guitar amplifier. The board contains a few odd components to drive front panel LED's that remind the guitarist which channel is active.
Several examples of this board have been built up, and the basic design seems to work exactly as intended. The only design issue is that the board shape for the relay, downloaded from Octopart, isn't correct. Pin spacing is too narrow, so relay pins have to be bent for insertion into the PTH holes. Another revision is needed to fix this problem.