docs(readme): added section on limitations

Author: meszaros-lajos-gyorgy

Diff for: README.md

@@ -11,3 +11,8 @@ This code monkey patches AudioParams with a method to get values at any time
 `AudioParam.prototype.getValueAtTime(t)` - calculates the value at `t` time based on scheduled changes
 
 `AudioParam.prototype.hasScheduledChangesAtTime(t)` - checks whether there are any changes scheduled at or after `t` time
+
+## TODOs / Limitations
+
+* `setValueCurveAtTime` interrupted with `cancelAndHoldAtTime` is not yet calculated, when evaluating schedulement
+( internally we replace events sliced by a cancelling event with a smaller, interpolated event, because we don't store the cancelling event )