[malka]

Yes it exists: https://ccrma.stanford.edu/~juhan/super_spec.html

But the issue is not that the spectrogram is low quality.

The issue is that the spectrogram only contains the amplitude information. You also need phase information for generating audio from the spectogram

[mcbuilder]

Interesting, can't you quantize and snap to a phase that makes sense to create the most musical resonance?