From: Vangelis forthnet Sent: Tuesday, May 9, 2017 3:44 PM Your "problematic" firmware has no support for the High Efficiency (HE-AAC) encoding profile. Radiomodes with a bitrate <= 96 kbps use that, while the ones >=128 use the Linn compatible standard Low Complexity (LC) profile; actually, HE-AAC is LC too, better described as HE-AAC LC, as indicated by the MI log.
Use by the BBC of HE-AAC components at bit rates of 96kbit/s and below may well be the explanation for the difficulty in playing those files. As I understand the AAC standard, players which are not able to handle HE components are required to ignore them. If the Linn player is failing to do so, there may be grounds for reporting this as a fault to Linn. In the meantime as you suggest the solution is probably to use a bit rate, perhaps 128kbit/s and above, encoded as AAC-LC.
A month or two ago someone else had a problem with a Linn player. His problem was that it would not play long M4A/AAC files. Some of the operas on Radio 3 can be up to 5 hours, and it would not play the longer ones. Linn was supposed to be investigating, but I don't remember hearing whether the problem had been fixed.
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