On Mon Jul 17 17:32:03 BST 2017, RS wrote:
At 48kbit/s Mediainfo shows the sampling rate as 48.0kHz / 24.0kHz.

... If you are referring to the original *low radiomodes as fetched by GiP, then, and someone correct me, please, if I'm wrong, I believe 48.0kHz SR applies to hardware/software media players which are capable of reproducing the SBR portion of the HE-AACv1 encode; for SBR incompatible players, only the LC portion is played back at half the SR, i.e. 24.0kHz (resulting in most higher frequencies of the spectum being muted...). If I have misunderstood and you're referring to something else, please disregard and accept my apologies :-)

Vangelis.

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