Thank you for your answer, but i have already done that and all i can find are .wav files, and the quantum seems to doesn't see them as wavetables files.
My problem so is : where can we find .wtb files or how could we create one.
For example i have an e370 from synthesis technology, the files for wavetable are .wav files. the same for the ER301 from orthogonal devices.
i also have a NW1 from waldorf, but the format for wave table is .wtrs
edit : so i eventually discover the analyse function in the wavetables tools wich permit to create new wave table from audio files....i will explore that.