[Treble-Enabled Device Development A/AB ROMS] CRCinAU:
I also notice that via logcat, when playing to a BT speaker from Spotify, I get a *ton* of these in logcat:

05-13 15:49:23.017 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.017 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.018 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.030 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.030 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.032 2406 4461 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.033 4538 4620 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.033 4538 4620 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.033 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.036 4538 23222 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.037 4538 23222 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.038 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.038 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.038 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.039 2406 4461 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.040 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.040 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.041 1216 1446 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.043 4538 4620 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.043 4538 4620 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.044 1216 1446 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.045 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.045 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.046 2406 4461 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.064 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.064 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.065 1216 1446 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.122 4538 4621 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.122 4538 4621 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.123 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.136 4538 23222 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.136 4538 23222 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.136 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.137 4538 4921 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.137 4538 4921 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.137 2406 4461 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.140 4538 4921 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.141 4538 4921 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.141 2406 4461 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.141 4538 23222 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.141 4538 23222 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.142 1886 2010 W AudioManager: updateAudioPortCache: listAudioPorts failed
05-13 15:49:23.143 4538 23222 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3
05-13 15:49:23.143 4538 23222 E AidlConversion: legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout: legacy input audio_channel_mask_t 0x3 contains unrecognized bits 0x3
05-13 15:49:23.143 1216 1446 W AudioManager: updateAudioPortCache: listAudioPorts failed

That's 150ms worth of log.

I tried enabling "Use System Wide BT HAL" - (not sure if I have to reboot for this?) but still got the same error messages...

EDIT: It seems this might be the fix and was posted in this thread earlier.

AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET: remove offending definitions... · DerTeufel/lineage_device_lenovo_x606fa@4f81a6a

01-16 20:14:46.994 551 551 W AidlConversion: legacy2aidl_audio_channel_mask_t_AudioChannelLayout: no AudioChannelLayout found for legacy input / voice audio_channel_mask_t value 0x3 01-16 20:14...

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