This video captures Synthesizer Keith‘s take on Carol Of The Bells, featuring 4 DIY sequencers.

The sequencers, in order of appearance, are:

• 8-Step With Built-in 555 VCO
• 8/16/24 Step in 5U Format
• MIDI-CV-Arpeggiator
• Cardboard Sequencer 

Other equipment used in the recording:

• Moog Source
• Arp Odyssey
• Roland Juno-106
• Realistic Concertmate-200 (AKA Casio VL-1)
• Yamaha TG-55
• Yamaha WX5 (driving the TG-55)
• Kawai R-100 (for MIDI to trigger sync)
• Yamaha YMC10 (for multitrack to MIDI sync)
• Tascam DP-32SD
• Dokorder 8140 (for tape echo)

Several other synths are visible in the background (notably a Paia 2700 modular), but they were not used in the production.