This window provides useful feedback to the ringer both during and after ringing. What is not evident from the static image shown here is that the graphic scrolls smoothly during ringing to provide a constant reference. After ringing (or during) the ringer's own line can be superimposed on the perfect blue line and provides a great way to address specific mistakes in the striking. Errors bars (blue for early, red for late) show the magnitude.

In the above image, for example, the ringer (ringing the 2nd to a course of Grandsire Triples) is consistently holding up too much when leaving the lead, but nevertheless failing to reach the back on time, before holding up too much again prior to coming back down. These errors can be pointed out in an entirely objective way that is immediately clear to the ringer.

The rows themselves are hidden in the above image, but they can be shown when needed.

The graphic can be scrolled up or down throughout the range of the ringing and it can be shrunk or expanded using the zoom control on the control panel. Both scrolling and zooming can be performed using touchscreen gestures if your screen and OS supports this.

The numbered circle at the top representing your own bell is highlighted. You can choose a different bell at any time when the bells are stood.

You can also choose more than one "user bell", in which case you can either focus on one of them at a time or show all the lines at the same time:

Replay

There is a Replay button on the Control Panel, allowing you to play back the ringing starting from any desired row.

The Control Panel

The control panel for the Blue Line window concerns itself mostly with a choice of visual options during and after ringing. It also allows you to specify how many initial signals you would like the program to ignore when compiling the statistics (it is often difficult to strike the first couple of blows accurately and this can spoil the statistics).

The button at the bottom ("Copy to Clipboard") copies the rows generated during some ringing to the PC's memory so that they can be pasted into a spreadsheet or other external document. (They are formatted to best suit pasting into a spreadsheet.)