i was searching GitHub and found this free synth
what do u think
https://github.com/greatest-ape/OctaSine
Four FM operators with parameters for volume, panning, modulation output, feedback, frequency modifiers (ratio, free and fine), envelope values (attack, decay, sustain, release) and toggling of white noise mode.
Flexible routing allows setting the operator modulation targets (with some limitations) as well as the amount of signal that is simply added to the final output, enabling additive synthesis.
Four LFOs with multiple waveforms, oneshot and loop modes and optional DAW BPM sync. They can target most operator parameters and most parameters of lower-index LFOs.
Each operator is connected to an attack-decay-sustain-release volume envelope with logarithmic slopes.
Per-operator white noise mode makes it easy to create percussive sounds such as hi-hats and cymbals.
Runs on macOS (definitely 10.15.7, probably later versions too), Windows 10 and Linux (X11 only) in VST2-compatible DAWs on 64-bit computers. Synthesis is SIMD-accelerated in many cases (SSE2, AVX).
Master volume and master frequency parameters
128 voices (using them all simultaneously might consume quite a bit of CPU time though)
Fully automatable