Pittsburgh Modular System 10.1 is a modular synthesizer system designed by Pittsburgh Modular. It is a semi-modular system, meaning that it does not require patching to make sound, but can be patched to create more complex sounds. It is a 10U Eurorack system, meaning it is 10U wide and can fit into a standard Eurorack case. It features two oscillators, two filters, two envelopes, two LFOs, two VCAs, and a mixer. It also has a variety of inputs and outputs, including MIDI, USB, and CV. Artists such as Aphex Twin, Nine Inch Nails, and Flying Lotus have used the Pittsburgh Modular System 10.1.