Idea - a feature which scans the track left to right and plays back tones based on the track.
You would hear two or more tones where there are loops or overlapping sections
this way you can "preview" the track easily
combine with spatial audio to give additional information
Spatial audio
using stereo could be effective to understand loops - you can hear the sound going to one side, to the other, and then back again.
the web Text-to-Speech engine may not support spatial audio?
Descriptions
Configurable verbosity: choose what gets read back
Sonification of Chart Data
The example chart sonification MP3 contains variation in volume and beats
could make tracking the audio information a bit tricky because the overall volume changes to follow the trend in the data, but there's also volume differences in the sample loops themselves.