It's generally not a slow fade; my experience is they sound fine then when the battery is about to go you've got about 20 seconds of slightly fuzzy notes, then nothing. So could easily happen when you're not playing.
@Lw. started
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It's generally not a slow fade; my experience is they sound fine then when the battery is about to go you've got about 20 seconds of slightly fuzzy notes, then nothing. So could easily happen when you're not playing.