DR-OM is a virtual synthesizer that simulates the hackable yard sale treasure of the same name. Dozens of DR-OM units have been adapted from a rare, limited science lab function generator that started turning up in flea markets in the 70s.
DIY synth enthusiasts discovered the device was easily hackable, and closely-guarded photocopies of the modded schematics have been handed around the community for years. The directions show how to rewire the generator into a nice little synth with two mixable Low Frequency Oscillators and a Voltage-Controlled Filter.
Here’s a demo of DR-OM in action:
DR-OM is now in the App Store for $1.99.