Fiio M9 - Digital Filter Mode; Wireless Playback Quality

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Digital filter mode
To set the filter modes: Sharp Roll-Off Filter, Slow Roll-Off Filter, Short delay Sharp Roll-Off
Filter, Short delay Slow Roll-Off Filter, Super Slow Roll-Off Filter
Wireless playback quality
When the Bluetooth receiver supports multiple Bluetooth audio codecs such as BTR3), you can
select which you want to use.