[kingsleyopara]

I've encoded xHE-AAC at 6 kbit/s mono, which is the closest match I could get. It performs much better and is widely supported (Android 9/iOS 13/macOS 10.15/Windows 11), although there are no free low bitrate encoders available yet. I used the Fraunhofer IIS Pro with EZ CD Audio Converter. It would be great if you could add it: https://filebin.net/x46m1x7n6d2t7e6b

[CharlesW]

Yes! This is even at 44.1 kHz, so you might even find that you get perceptually better results by trying a lower sampling rate (32 kHz, 22 kHz, etc.).