According to the parts list and the instructions, which are available as a .pdf from the Paia site, the power supply is 12V - 14V 500mA.
The issue of the ASR envelope for the Filter vs the ADSR for the VCA is a point of personal preference. The fact that you actually have separate envelope generators for the Filter and VCA is a bonus in this price range. Most "budget" model analog synths, such as the Moog Rogue (Realistic MG-1, Moog Taurus II), , ARP Axxe, ARP Solus, Roland SH-101, Korg MS-10, and Yamaha CS-01. If you are handy with electronics you could possibly switch and use the ADSR envelope for the filter.
Moog Micromoog, Dotcom Modular Briefcase System