I want to know what is the difference for the top level and max level
I recommend checking the user guide provided for users. I have downloaded the PDF file and I have found that all the features and options available within the application are described with an in-depth guide on how to use the software as well.
Download user guide in PDF format: http://soundplan.com.au/sites/soundplan.co.nz/files/SoundPLAN%20Users%20Manual.pdf
Note: You will need a compatible PDF reader to open the file.
