Is there really a copyright issue? Mimicry artists and tribute bands have duplicated original voices without a problem. Technically, you are not reproducing any

Is there really a copyright issue? Mimicry artists and tribute bands have duplicated original voices without a problem. Technically, you are not reproducing any recording owned by anyone. It's brand new synthesis! It would be interesting to see if any courts rules this is not the case. You can own your spoken speech, but can you really own spectrogram of wave patterns?