Roland MC-4 MicroComposer Sequencer & OP-8 CV Interface

Roland MC-4 Micro Composer and OP-8 CV interface, both units work as they should.

The MC-4 in near mint condition and the OP-8 in mint. OP-8 is 220v. MC-4 is 110v.

The Roland MC-4 MicroComposer is a legendary, early microprocessor-based CV/Gate step sequencer released in 1981. Famous for its incredibly tight timing, it requires users to manually input exact numerical values for pitch, step time, and gate length rather than featuring a traditional piano roll. [1, 2, 3, 4, 5]Core Architecture & Workflow

• Programming: Features a numeric calculator-style keypad used to manually program sequences, though it can also record live input from a monophonic synth keyboard. [1, 2]
• Outputs: Provides four independent channels, each capable of outputting a Control Voltage (CV) for pitch, a second CV for modulation, and a Gate trigger. [1, 2]
• Sync & Connectivity: Equipped with DIN Sync and Tape Sync for locking to classic drum machines and older hardware. [1]
• Volatile Memory: Like its predecessor (the MC-8), the MC-4 has volatile memory, meaning all programmed data is lost when powered down. Users relied on the Roland MTR-100 digital cassette recorder or standard tape decks to save sequences via Cassette Memory Transfer (CMT)