An analog sequencer is a music sequencer constructed from analog (analogue) electronics, invented in the first half of the 20th century.
Typical analog sequencer (Korg SQ-10)
Buchla 146 Sequential Voltage Source module (16step × 3) with 114 keyboard on Buchla 100 at NYU (c. 1964).
Moog 960 Sequential Controller with 962 Sequential Switch modules (1968–) on Moog Modular 55 (1972–1981)
One of the first commercially available analog sequencers (bottom, 3×8-step and 3×16-step) on Buchla 100 (1964/1966)
A music sequencer is a device or application software that can record, edit, or play back music, by handling note and performance information in several forms, typically CV/Gate, MIDI, or Open Sound Control, and possibly audio and automation data for digital audio workstations (DAWs) and plug-ins.
1980s typical software sequencer platform, using Atari Mega ST computer
User interface on Steinberg Cubase 6, a digital audio workstation with an integrated software sequencer
An analog sequencer
A step rhythm sequencer on the drum machine