The SoundPro main window gives you access to all the capabilities of JMRI.
The Audio Table lets you see what audio objects have been defined, and what information they currently contain. From the table, you can create a new audio object.
The Audio Listener defines where the person hearing the sounds is located.
An Audio Buffer holds the actual sound sample data.
n-Track Studio is an audio and MIDI multitrack recorder that turns your Mac into a full-fledged recording studio.