Do a sort of HEAC - High Efficiency Audio Codec exists?
I think HE-AAC fits that bill.


  High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding
  format for lossy data compression of digital audio defined as an
  MPEG-4 Audio profile in ISO/IEC 14496-3. It is an extension of Low
  Complexity AAC (AAC LC) optimized for low-bitrate applications such as
  streaming audio. HE-AAC version 1 profile (HE-AAC v1) uses spectral
  band replication (SBR) to enhance the compression efficiency in the
  frequency domain. HE-AAC version 2 profile (HE-AAC v2) couples SBR
  with Parametric Stereo (PS) to enhance the compression efficiency of
  stereo signals. It is a standardized and improved version of the
  AACplus codec.


As does Opus.


  Opus is a lossy audio coding format developed by the Xiph.Org
  Foundation and standardized by the Internet Engineering Task Force,
  designed to efficiently code speech and general audio in a single
  format, while remaining low-latency enough for real-time interactive
  communication and low-complexity enough for low end ARM3
  processors.[3][4] Opus replaces both Vorbis and Speex for new
  applications, and several blind listening tests have ranked it higher
  quality than any other standard audio format at any given bitrate
  until transparency is reached, including MP3, AAC, and HE-AAC.