After struggling with setting up an audio player in Blocs, I think I’ve now found a good solution. If you visit THIS DEMO site you will see an audio player in action. It was created with commercial software. However, I’ve created a finished player and packed it up into a zip file. The player can be customised with the addition of more tracks and various text labels that are displayed in the player interface. It does require the editing of the HTML file before adding it to Blocs, but it is very simple (full instructions included in the zip file). This is a responsive player that responds to any device size. Take a look and give it a go. Please note, the demo only shows three tracks, but you can add as many as you need. If you add more than 22 tracks, the play list will show a scroll bar so that the additional tracks can be selected.