- added Marisa Kirisame's CHAN_OVERLAP flag.
- exported S_IsActorPlayingSomething to ZScript.
The sound API change required deprecating A_PlaySound and S_Sound. There are now new variants S_StartSound and A_StartSound which have two distinct parameters for channel and flags.
Duration of sound playback and subtitles display will be synchronized if sound id is specified
For existing Strife messages this works out of the box
https://forum.zdoom.org/viewtopic.php?t=65379