After experimenting with the FLAC audio format, i have decided to convert all (except motor0 to motor7) the existing .wav files into the .flac sound format. the latest version of OpenBVE has support for .flac sound files, and it has a very high compression rate, yet loss-less audio!
Have a look at the difference:
![](http://img560.imageshack.us/img560/5469/audioc.png)