In this analysis, the observer has to decide whether the sounds are the same or different. Luscinia stores groups of sounds that have been ranked as "same" as "types".
The upper spectrogram always represents the sounds that have been already sorted. For every type, an exemplar is chosen by the user (chosen by the "Spectrograms match, 1 better" or "Spectrograms match, 2 better" buttons).
The lower spectrogram represents a new sound that has not yet been sorted. When a new sound is displayed in the lower spectrogram, the program will run through all the sorted spectrograms until either a match is found, or all the types have been exhausted (upon which event, Luscinia will generate a new type).
The controls in the upper left hand corner allow the user to change the appearance of the spectrograms (see the Settings tab of the Spectrogram Window for more details). The sounds can also be played back.