Thanks for your answers but the problem is not in recording. The meter is showing the signal when I record and when I play, so, the voice is recorded but I can't hear it neither alone when I select it in the audio track, nor together when I play it with the midi instruments.
After some trys, I selected Asio instead of mme and the voice is clearly there. But in this case I can't record the voice cause the midi sounds goes in the audio track...

Blisco