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According to a book: RHYTHM MACHINES (Volume 1) which "documents the rise and fall of the preset pattern rhythm units" there is a listing for a Selmer HR-30.
Also in the Western Works photo you can just barely see an EMS Synthi Hi Fli... incredibly rare and sought after now.
― Reeves Gabrels' Funko Pop (majorairbro), Sunday, 4 February 2024 07:05 (two months ago) link
The Hillwood HR-30 looks quite promising. I've had it on search for ages, with no hits on ebay or reverb. This has got to be just a rare beast of a box.
― Sassy Boutonnière (ledriver), Monday, 5 February 2024 06:11 (two months ago) link