Nope. AAC is lossy but better than MP3. You may be thinking of ALAC - Apple 
Lossless Audio Codec.
Just to add to the confusion, here’s a clip from a good Wikipedia article:

"Apple Lossless data is frequently stored within an MP4 container with the 
filename extension .m4a. This extension is also used by Apple for lossy AAC 
audio data in an MP4 container (same container, different audio encoding). 
However, Apple Lossless is not a variant of AAC (which is a lossy format), but 
rather a distinct lossless format that uses linear prediction similar to other 
lossless codecs.” 


> On Apr 9, 2020, at 7:47 AM, Bob Sneidar via use-livecode 
> <> wrote:
> As I recall, it is lossless, yes?
> Bob S
>> On Apr 8, 2020, at 7:46 PM, Jerry Jensen via use-livecode 
>> <> wrote:
>> Hi J,
>> AAC is Advanced Audio Compression - successor to MP3.
>> Hope this will help you figure out how to play it.
>> .Jerry

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