The IVAS codec's ParamISM mode encodes three or four audio objects as a stereo downmix plus compact two-dominant-object side information, and listening tests show it beats multi-mono EVS at similar or lower bit rate.
Binaural Cue Coding - Part II: Schemes and Applications,
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Parametric Object Coding in IVAS: Efficient Coding of Multiple Audio Objects at Low Bit Rates
The IVAS codec's ParamISM mode encodes three or four audio objects as a stereo downmix plus compact two-dominant-object side information, and listening tests show it beats multi-mono EVS at similar or lower bit rate.