Created attachment 411089 [details] samplefile Actual behavior: If you set SpeechSynthesisUtterance.rate to 4 or higher in speechSynthesis.speak for Japanese speech, it is the same as before. Expected behavior:. The speed will be of the specified value. Or the speed of the limit value. A sample file is attached. To reproduce it, follow these steps. --- Steps: 1. change the rate to 0.5. 2. Press the speak button. 4. 3. Press the "cancel" button. 5. 4. Change Rate to 4. 5. press the speak button. ---
<rdar://problem/70231867>