Hi resolved the problem.
I had 2 mute video and 5 external audio (boom, ch1 ch2, ambient). So, i merged each one video tracks with audio and then i maked multiclip with the two clips merged at the IN point. That’s it!
I worked with copies of original clips in a different bin and I didn’t delete this bin. It works great!.
AppleProRes 442 LT, Audio Wav 24bit 48 khz.
FCP 7.0.3 on Mac Book Pro Lion 2,5 Ghz Intel Core i7 8GB ram 1333 Mhz DDR 3
Happy!!
Gerard