After installing the latest Turbo OutRun Reimagined v5.0 test update, I am unable to switch my songs; however, this issue was not present in the previous v5.0 test and v4.2.
You should be able to skip the song that's playing and go to the next one if you've chosen "random". Otherwise it keeps on playing the song you've selected (for now). If this doesn't work, let me know.
