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| PPG EVU
The EVU (Expansion Voice Unit) is, in principle, a Wave 2.3 without keyboard. It was created as a precursor to the Wave 2.3 to add more voices to the PPG System. In addition to that, it was an improvement over the Wave 2.2 that was sold at that time, since it could play 8 sounds at the same time and already implemented 12-bit technology. As a specialty, each of the 8 voices can be adjusted separately in loudness and panorama position.
Techie ThingsI got my EVU in a non-working state and had to invest a lot of time to get it working. Here's a little picture from the repair period - EVU in "Debug Mode" :-)
Additionally, the EVU I got was one of an earlier series - it still had an I/O-82-Board without MIDI and operating system V1. To make up for that, I added MIDI and upgraded it to V3.
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One of my current projects is
to disassemble and analyze operating system V6 of the Wave 2.2, 2.3, and V3 of
the EVU. Should anybody be interested in helping with the project or have old
PPG Assembler listings, please 
In case you find this bewildering, this is a view of the EVU's PCBs put on
top of the case. Much easier to poke into the various contacts with a DMM
or logic probe this way.