Is Vocos suitable for singing?

[TechInterMezzo]

I tried the pretrained model with mel spectrograms directly generated from singing samples and it does not sound as good as: https://github.com/yl4579/HiFTNet

The linked vocoder uses neural source-filter (https://nii-yamagishilab.github.io/samples-nsf/) like some other singing voice conversion models.

So could the architecture be the reason for the difference in quality or does Vocos just need to be additionaly trained on singing to reach the same quality?