This video, via Heavy Metal Kid, is a time-lapse video of building Two Thousand Six Hundred #38, the ARP 2600 DIY clone from The Human Comparator.

Here’s what Heavy Metal Kid has to say about it:

I built mine in March 2014, as seen in this time lapse. Some parts of the build were not documented due to battery running out.

All sounds in the video come from this synthesizer. The middle section is the TTSH sequencing itself via sample and hold. The intro and outro sections are sequenced by an Elektron Analog 4, and the outro section is multi tracked.