Available as an assembled Module and as a DIY project.
This Module is currently available.
Multipurpose utility module, offset/attenuverter, mixer, multiples
The panel packs three attenuverter/offset generators with LEDs, a mixer that can be a 4->1 or two 2->1s, two 1->2 buffered multiples and two 4-way passive multiples into 16hp.
Note the current draw data comes from Meme Antenna and is commented as being untested.
13 Users are observing this
These merchants probably sell this module. Huh?
Manhattan Analog MVP Manual Voltage