Visuals:
The "bright" image in between measure A and measure B indicates which beat is the current beat being played. When the software is stopped, the "bright" image defauts to the first 16th note.
The label to the right of the reset button shows which measure is currently being played. When the software is stopped, it defaults to the first measure of the currently selected "Measure Play Order".

Keyboard Shortcuts:
Choosing audio - Tab button to get to the next Choice menu. Use shift tab to get the the previous.
Arrow key can be used to select different audio files.
An audio file can also be selected by typing the letter representing that file. No file can be selected by pressing the space bar.

Tempo - While textbox for the tempo is selected, the tempo can be changed by using the up and down arrow keys.