[power-pro] Add a "Clear item" item to "Edit list item"

[lakeshoresurfer]

Hi Bruce,

Would be possible to have "Clear item" button on the "Edit list item"
window ?

Do have already implemented a copy & paste feature.

A clear function that resets / clears all parameters for a particular
item on Left/Middle/Right tab would be nice to have.

Thanks and cheers form snowy Toronto.