Hi again people. I had just completed a new project tonight which had two audio tracks, an instrumental backing track wav file and an isolated vocal track from a different song. For some reason later on during my editing, once the red playback marker got to the waveforms of the vocal section in yellow (and this happened even before I'd cut that section) the vocal was silent until it got to the next section, 47 seconds in. And my exported mp4 was also missing the first 47 seconds. Only the wav file was playing from the start. Screenshot:
https://i.postimg.cc/mZH5grbx/bandicam_2018-09-22_01-19-38-905.jpg
But when I placed the marker a little way inside the yellow box, then the vocals played from the start. What I did in the end was cut the first 9 seconds of the earth wind and fire wav and found a new place to start the music where the marker was already inside the yellow box, then it worked. But it meant losing a few bars of the intro music I wanted. Any reason for this behaviour? All I had done to the vocal track was increase the tempo by 5 bpm and adjust the volume level using the slider in the centre of the track.