One of my first "hacks for hire", done for Jack Freudenheim, c. 1980: I added an external switch pad to an Electro Harmonix DRM16 drum machine so that individual drum sounds could be manually triggered. (This was in the age before affordable sampling, when drum machines still had that electro disco sound.) Note holes and scribe marks on metal -- obviously the hardness of the steel case thwarted a more elegant solution than the ribbon cable and perf board. Photo by Jack Freudenheim