Finally i found the solution! The new Audacity version(1.3.3) has at the preferences section and in the “audio I/O” field, two keyes about latency. There i put 10 millisec. in both (just for trial-without knowing anything). And that’s it! All the latency disappears! No skips, no lag, no delay! But if there is someone expert that can tell to us what exactly we must put at the latency field of Audacity 1.3.3 it will be very usefull. Thanks.