via this auction
"This Paia system was assembled to use as a portable electronic music box. It is really small but contains two full voices, plus a 4780 sequencer and a 4712 spring reverb. There are two VCOs, two Bandpass Filters, and two VCAs from the 2700 series. Then there is a 2700 series Sine/PWM and a 4740 ADSR. The power supply and spring reverb are inside the box, but the faceplates will be included, along with some random Paia spare parts. I will also include the original manuals/assembly instructions for the modules. Please note that the reverb is accessible via the two jacks labeled with green tape. Also note that the modules have been modified; the Paia pin jacks have been replaced with 1/8" (3.5mm) jacks to make the system easier to use.
Cosmetically this little modular looks good and all the modules work. HOWEVER, the system is under-powered. The power supply will need to be upgraded for everything to perform to spec. So all the modules work, but you will need more power to use them all together. As you can see in the pictures, all the modules have been modified with 1/8" jacks and some have been modified with extra switches and knobs. The VCOs have tuning knobs and one has a range switch (so it can be used as an LFO). The Bandpass VCFs have range/response switches added. I did not do these mods, but they work and they help make the system more useful"
