Adding tracks to audio file - timing issue

[Mike_Parks]

Hi,
I am building an audio file by adding various tracks on to it using Audacity. The second track I added worked just fine but I have now added a third and have a timing issue. I have inserted 3 seconds of silence between the second track and the new track exactly the same as I did between the first and second tracks. However, when I assign the music file to Vixen (2) and play the sequence the start point for the third track is around 5 seconds later than it should be.
I know I am assigning the right music file because when I 'Export' the file in Audacity I give each attempt a different file name.
Thanks for any thoughts,
Mike

[Mike_Parks]

Update on this issue - Tried adding a longer silence at the start of the audio file and this is not reflected in the Vixen sequence either. Also just turned on audio visualisation and this doesn't line up with when the music actually plays either !!