Dear @slaterjess, @DanielKuroschHopfner, @ThomasY, @walter, @JensBoelte thanks for flagging. As it happens updating howler.js, one of the audio libraries PsychoJS relies on, is all it takes in this case and the fix has already made it into PsychoPy master. Without upgrading your PsychoPy installation, you can also edit 'index.html in your project to load in howler.js v2.2.1 as shown in the respective PR. Please let me know if you need more details, s.