CellSynth 1.7 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Audio & Video Tools, more precisely General. We recommend checking the downloaded files with any free antivirus.
From the developer:
Sync Different! CellSynth addresses several of the main areas in computer music, notably audio synthesis, audio sequencing, sample manipulation, audio processing and automation sequencing. Unlike many of the more conventional software synthesisers on the market, it is compact and easy to use, and does not require detailed synthesis knowledge.