a phase vocoder better than csound

Hi! I'm not new in Csound, but I'm very dissatisfied by the sound result of the phase vocoder! (opcode pvoc with analysis .pva)
I tried to use the phase vocoder technique for all types of sounds because, for me, is one of the most interesting processes to elaborate sounds. But, despite my countless attempts, I always have a sound with metallic, terrible interferences. Despite perfect (or almost so...) recorders as basic sound. Now I ask to the community if anyone knows a program or similar that work better using phase vocoder tehcnique...
Thank YOu!

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