The virtual key model you are using with T_ALP is correct. I’m not sure why it is not working for you. Could you share your whole keyboard file (you can send it via direct message to me or attach it to your post if you wish).
Respectfully, due to the inactiveness of the conversation, this topic is now closed for any further discussion.
Please feel free to create a new topic if there is any question or the issue persists.