Pioneer SC-LX901 Product Reference Manual page 16

Audio Formats
Variable File Play Action
LX901 LX801 LX701
Various features to easily access and play your music library are
available for the AV receivers. Using the remote control, you can
fast forward/fast rewind during playback, and sort songs
(alphabetical/track order). In addition to these operations, the
iControlAV5 app lets you search songs and albums. This feature
works even if you don't remember the exact title.
Search Songs on iControlAV5
Gapless Playback
LX901 LX801 LX701 LX502
Enjoy smooth, uninterrupted audio playback for WAV, FLAC, and
Apple Lossless files. The function is ideal for listening to music
tracks intended for continuous play, such as classical music,
progressive rock, concept albums, or live recordings.
* Gapless playback only available for USB memory playback.
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AV RECEIVERS REFERENCE GUIDE