line question

When a patcher is intended for user interaction or input, as yours seems to be, I try to make it as user-friendly as possible. This is just one of several possible solutions that allow you to see the values:

1. while they are being modified,
   

2. in the correct format, and
   

3. before they are entered into the target object.
   The formatted data thus set (stored) in the message object where it is deferred until it receives a bang. This type of information feedback allows the user to take better control of these parameters.

I'm not sure if I understand your of idea of "clearing" the message when line's ramp is finished. Nonetheless, I've added a clearing functionality that will leave you with a blank message box as well a recall feature in case you want to undo the clear.

I hope this helps. Good luck.