PROTEUS 1 - 16 Bit Multi Timbral Digital Sound Module $250 Shipping extra. Single rack size. This is a very straight forward instrument, and is one of the very best 80’s/early 90’s single-rack sound modules. The sounds for the Proteus 1 were selected from the popular EIII library. 4Mb of RAM - total of 384 patches. You will love the authentic Grand Piano sound as well as the string and brass patches. This was my go-to piano sound on many projects as it sounds real.