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I use it for quite some time and it is for me the best piano freeware.
For comparison I have a branch FP8 and within minutes you get play all the pianos of FP8.

The rglages are super simple but very ffective vraimentt and you can get the sound you want.
It is somewhat less expressive than FP7 even if it comes a little closer.

The pros: free, rglages and sound
The -: lacks a bit of expressiveness when compared to pianos latest generation.