Yes, if you stop PlayIt Live or interrupt the Loudness Analysis process before it completes, it will automatically resume where it left off when you restart the analysis. The tool keeps track of which tracks have already been processed, so you won't lose any progress if you need to close the software or restart your computer during the analysis.

When you run Loudness Analysis again via Tools > Loudness Analysis and click Start Loudness Analysis, PlayIt Live will skip any tracks that have already been analysed and continue processing the remaining tracks. This makes it safe to run the analysis in stages, which is particularly helpful since analysing a large music library can take several hours depending on your collection size and computer speed. Any new tracks you add to your database after the initial analysis will also be automatically processed in the background.