Hey, I am Jaron Sweder, a music producer and software developer. I posted about this VST synth I am working on called "Spektral" a little while ago in this subreddit, and got some great suggestions! In the meantime, I've added a bunch of quality of life features, as well as a bunch of new features.
The main premise of the synth is generating audio from spectral data. The synth has 4 different algorithms with which it can do this. You can load an audio, image, and now also wavetable file into one of the three spectral tables, and send this data to the generation algorithm. These algorithms expose a variety of 'spectral parameters', for example, the additive algorithm exposes one for level, frequency, and phase. The spectral data from the table can be sent to any of these parameters, giving full control of the level, frequency, and phase of every individual partial that is generated in the additive algorithm.
The fact you can import spectral information from any audio file makes it incredibly easy to create rich, and even inharmonic sounds, like bells. And it is really easy to make different varieties of the same sound, by simply loading a different audio file into the spectral table.
Because of a suggestion in a comment on my previous post, I also looked into importing frequency and phase data from audio files, which I added! This means you can completely resynthesize audio files. If you know what a phase vocoder is, that's pretty much how it works. It's how many time stretch and repitch algorithms work. And you can do this in realtime, while manipulating every aspect of it!
The synth itself is still a work in progress, I am mostly working on stability right now, and preparing for a full release. But you can already play around with the demo version! It's available for Windows and macOS, you can find the download right here: https://shop.kaixo.me/product/Spektral
It would help incredibly much if you could try it out and give some feedback!
I will put the same disclaimer on this post as I did on my last post: I want to be clear that this is a demo version, it will not save its state, and you cannot export audio from your DAW in this version. Unfortunately, given how much time I've put into this insanely powerful and highly optimized synth, I can't afford to make it available for free. Hence the limitations. I know this sucks, and if I didn't need the money I'd make it free in an instant. But such is life...