The Annotation Tool is useful if you want to edit and reshape the layers produced by Regroover. With it you can selectively merge elements from one layer to another. This allows you to recombine separated sounds until you reach the perfect balance between how many layers you want, and what you want them to contain.
Clicking on the eraser icon activates the annotation tool. While the Annotation Tool is enabled,
- Select a layer to create an annotation region by double clicking.
- Resize annotation regions by dragging either end.
- Use the audition mode inside (Shift+Cmd+Click for macOS or Shift+Click for Windows) an annotation region to playback the region and make sure your selection is correct.
- De-select an area by Shift+clicking in the area you want to de-select.
While the Annotation Tool is enabled, double click all the elements in Layer 1 that we want to merge to Layer 2.
At the same time, make sure that Layers 3 and 4 are locked as you don't want them to change at all.
Click the Split button.
- Layer 2 now contains all the elements that we wanted to merge from Layer 1.
- Layers 3 and 4 were locked, and so nothing changed.
- The remaining elements in Layer 1 that were not selected with the Annotation Tool, did not change at all either.
Annotation is not a simple Copy/Paste operation and will change the audio of all layers. So, it is almost always best to annotate all the elements that you want to merge in one pass for each layer, rather than doing it one element at a time.
In our example, if we did this one element at a time and pressed Split every time, the algorithm would split again things in a different way, and so anything that was merged before the current selection would be 'returned' back to Layer 1, and might sound a little differently. This is because a new extraction has taken place.