Poly-850 2.4 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within Audio & Video Tools, more precisely Music Production. The actual developer of this Mac application is Synapse Audio Software. The default filename for the application's installer is poly_au_demo.zip. The following version: 2.4 is the most frequently downloaded one by the program users.
From the developer:
The Poly-850 is a VSTi / DXi synthesizer plug-in, which started out as an emulation of a vintage synth, but went beyond that by adding a several improvements and new features over the original.
Additionally, automation and a redesigned user interface with direct access to every parameter, make it much more user friendly and accessible, than the original unit.