Reconstructed your project in the menu order shown. Played in VP, there are several audio glitches. Times are approximate...
Music cuts off sharply at 10:12 (with long pause prior to violin) and at 57:03
Music cuts in sharply at 14:30, 41:06 and 1:32:44
The audio source files, reviewed briefly, appeared to contain these anomalies.
Outputted the project to video at 320 x 240 resolution as an ISO image (which can be used to create a DVD). When this was reviewed in Media Player Classic/HC it sounded the same as when played in VP. There are pauses between some segments/selections but no doubt that is intentional.