Workaround for ringer off with hardware switch on iOS

Plays a single frame of silent audio MP3 from an <audio> when initializing the Web Audio context. This ensures that the audio mixer sends output to the media channel, not the ringer channel, avoiding being muted. Resolves #600
bvibber · Apr 6, 2022 · 561757d · 561757d
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diff --git a/README.md b/README.md
@@ -9,6 +9,7 @@ Based around libogg, libvorbis, libtheora, libopus, libvpx, libnestegg and dav1d
 
 1.8.9 - ????-??-??
 * Bump yuv-canvas to 1.2.11, further perf improvments for frame drawing
+* Workaround gets audio working when ringer is disabled by iOS hardware switch
 
 1.8.8 - 2022-04-04
 * Bump yuv-canvas to 1.2.10, fixes WebGL scaling bug in Netscape/macOS; adjustment to prior performance tweaks.