TTM Works released ttm002 Synth A for free, a digital synthesizer with a unique waveform synthesis engine and modulation mechanism.
ttm002 can generate arbitrary waveforms by adjusting the balance of four basic waveforms, and combinations of the four basic waveforms are provided as presets.
Instead of shaving the waveforms with a filter, as on most synthesizers, the phase of the generated waveforms can be varied over time to obtain an arbitrary timbre.
For final tone adjustment, a high-pass filter, low-pass filter, and chorus (scan vibrato) are provided.
Although it does not have a flashy sound that is very synthesizer-like, it can quickly approach the practical sound needed for a song. How to edit the basic waveform (with a text editor!) I hope to create preset data with you.
More info and free download here: TTM Works released ttm002(Synth A) v1.00 for Windows