Check if your audio file is "clipping." If the source volume is at 100%, the peaks of the waves get flattened. Drop the source volume to 70% and use the 2B’s physical dials to increase power instead. "One channel isn't working"
You don’t "upload" files to the 2B’s internal memory like an iPod; rather, you play them through the device using the or the Audio Input . estim 2b audio files install
Sites like Miloflow provide user-generated content. Check if your audio file is "clipping
The LED lights on the 2B should flicker in time with the audio. estim 2b audio files install