Why don't the programmed voice track and voiceovers play at the same time?

[cheodj]

I have a question, I have placed the recorded voiceover of the song artist and titled it in tracktool so that it plays with the song and everything is fine, then I decide to include voicetrak to the list so that an artist comment is made and I set the voicetrack to stop at the intro of the song subtracting the seconds of the voiceover of the song so that everything ends when the singing starts, then I realize that the voicetrack sounds until the intro but the voiceover of the song does not. If I delete the voicetrack then the voiceover sounds, I ask can't both sound? Or am I doing something wrong? I do the same process from the auto into and both work, but I don't know why it doesn't do it all the time if I place the auto intro it sounds at 100%. I would like to know a solution, thanks