This note is taken from OpenLabs website: "three standard, pre-built configurations of eKo will be offered", in addition to their custom offerings. Again, remembering that this is a PC computer in a keyboard box, the standard configurations probably come with an audio card which has 128-note synth polyphony. I imagine that you could install your own soundcard(s) and/or install softsynths which have as much polyphony as the CPU and RAM can handle.