I thank you all,
you were really clear.
I had chances to test Renoise sample potential and I’m proud of it. The only tool I’m missing directly in the box is the noise reduction. But I’ve found that a guy did it New Tool (2.8): Noise Reduction
I really think now that my use of vst was only a bad habit.
I do prefer to work with pure audio samples,
if a day I’ll need some old vst sound I’ll use the method used by sji, recording and resampling.
So thank you all very much,
I’ll probably buy my license today 
Thank you!