Module is available as a DIY project only.
No info about availability.
Grayscale panel for the Dual Function Generator (Buchla/Toppobrillo 281 PCB)
Grayscale panel for the Buchla/Toppobrillo 281 PCB:
http://www.muffwiggler.com/forum/viewtopic.php?p=1200493#1200493
http://grayscale.info/panels/buchla-toppobrillo-281-dual-function-generator/
3 Users are observing this
These merchants probably sell this module. Huh?