CellSynth 1.7 for Mac was free to download from our software library. The software is included in Audio & Video Tools.
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.