Rockbox Ports are now being developed for various digital audio players!
Is it at the "Su" sounds, that you hear twice during the file? Adjusting the EQ precut to -2.0 seems to resolve the sounds I think you might be hearing.
Any lossy codec will add noise, which will push you into distortion.
Did you try adjusting the EQ precut, and enabling it, as I suggested?
and about high isn't a big trouble,just need to put volume down,and there is
I have, however, found a workaround for the problem: Enable the Equalizer and set the Precut to -5dB but leave all other settings untouched (i.e. leave the graphical EQ at the "flat" default setting). The distortion then disappears.
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