[WP76xx] AT!avtoneplay latency

Hi All

Application:
we connect a digit keyboard to our host, when we push digit button(0-9), we can using at!avtoneplay=0,x,200 to play tone voice.

Question:
Now , we found the at!avtoneplay command has latency about 2 seconds, it’s too long.
For example, if you use a mobile phone, the input number is very fast, and you can hear the tone in time.
I think if the letency can reduce to 200ms, it’s better.

Does anyone have some suggestion?