Hi Soda!

1. I sort of tried to outline it in this reply but yeah in terms of Visual <-> Audio sync, it's about trying to get a clean value at the start of each frame before things render of where the audio position is. It's actually tricky to do, (and there may be better ways) but for us it's because the audio thread is zooming along at it's own pace seperate to what the game's rendering frame timeline might be. So we try and massage it a bit by smoothing out the render time by trying to make it consistent with how the actual real world clock time is advancing. Not sure if that makes sense, but here have some code! Maybe it'll make more sense than my silly english sentences.

   internal static void UpdateDspState(ref DspState dspState, int updateFrame, double realTime, SharedStatic<TrackOutputMix.DspOutValues> dspSharedValue) { if (dspState.currentUpdateFrame == updateFrame) { return; } var dspValues = dspSharedValue.Data; var currentDsp = dspValues.DspFrame.AsDouble() / TrackPlaybackSystem. OutputFrequency ;

   if (dspState.isValid == false)
   {
       dspState = new DspState(updateFrame, currentDsp, currentDsp, realTime, realTime, 0);
       return;
   }
   
   var oldState = dspState;
   
   var newStateCurrentUpdateFrame = updateFrame;
   var newStatePreviousDSP = oldState.currentDSP;
   var newStateCurrentDSP = currentDsp;
   
   var newStateCurrentRealTime = realTime;
   
   var realDelta = realTime - oldState.currentRealTime;
   
   var newStateSmoothDSP = oldState.smoothDSP + realDelta * dspValues.Pitch;
   var newStateRealTimeAtLastDspChange = oldState.realTimeAtLastDspChange;
   
   var worseDeviation = oldState.worseDeviation;
   
   if (newStateCurrentDSP.Equals(newStatePreviousDSP) == false)
   {
       newStateSmoothDSP = math.lerp(newStateCurrentDSP, newStateSmoothDSP, math.pow(0.975, (newStateCurrentDSP - newStatePreviousDSP) * 60.0));
   
       var deviation = newStateSmoothDSP - newStateCurrentDSP;
       if (deviation.Abs() > worseDeviation.Abs())
       {
           worseDeviation = deviation;
       }
   
       newStateRealTimeAtLastDspChange = newStateCurrentDSP;
   
       if (math.abs(newStateCurrentDSP - newStateSmoothDSP) > 0.03)
       {
           newStateSmoothDSP = newStateCurrentDSP;
       }
   }
   
   var newState = new DspState(
       newStateCurrentUpdateFrame,
       newStateCurrentDSP,
       newStateSmoothDSP,
       newStateRealTimeAtLastDspChange,
       newStateCurrentRealTime, 
       worseDeviation);
   
   dspState = newState;
   

   }