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A clock signal for controlling the tempo of sequencers, arpeggiators, and drum machines, distributed using cables with DIN-style connectors (yes, just like old-fashioned MIDI connectors, but DIN Sync is even older). Roland pioneered this standard, which included sending 24 pulses per quarter note (PPQN), giving rise to the alternate name Sync24. Korg equipment used a variation of this running at 48 pulses per quarter note, also known as Sync48. DIN Sync is still a popular way of sending a clock signal to a modular synth today, especially when interfacing with other vintage synthesizers, sequencers, and drum machines.

(There’s also a synthesizer module manufacturer called DinSync. In addition to a drum machine, they also make normal modules such as oscillators and filters.)

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