What's the modular system in this Can video from 1975?

Can anyone ID the modular setup used by Irmin Schmidt in this performance of Vernal Equinox on Old Grey Whistle Test?

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It’s actually a custom effects box he called the Alpha 77. There’s a bit about it at the bottom of this Sound on Sound article:

https://www.soundonsound.com/people/finding-lost-can-tapes-jono-padmore-irmin-schmidt-daniel-miller

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Oh nice! Thank you for that!

This is fascinating, thanks for drawing attention to it.
Can we try to ID each part?

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OMG… that is an actual pop-top vest!!!

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