FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 81)

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7. Frequency spectrum playing page
There is a newly added frequency spectrum mode in the now playing page, which
has 3 built-in spectrum effects available. Besides, users can self-define Full screen
display or Original display for the spectrum mode.
How to enable it: go to the Settings menu in FiiO Music app->Theme->Now
playing page. Choose Spectrum display.
Square cover and large cover: