SongKong 3.5 released today, in previous releases the main focus has been on improving the 
Fix Songs task but in this release we wanted to review other part of the application application, especially 
Delete Duplicates Songs 
Delete Duplicate Songs
First of all we found some bugs in Delete Duplicates that have now been fixed.
The help for Delete Duplicates has been completely rewritten to give more detail and make more sense for non-MusicBrainzers and additional checks and balances have been added to make Delete Duplicates work better in Trial mode.
The we added a new option to 
Song is a duplicate if has same called 
Same song (metadata only). This is very similar to 
Same MusicBrainz song only for finding duplicate songs without being concerned about albums, but without the need to match the songs to MusicBrainz first (although we would always recommend using the MusicBrainz based options whenever possible)
Help 
Help has been edited, including simplification of the terminology such as using 
Album instead of 
Release and 
Song instead of 
Recording. We have added a 
Pdf version accessible from the Help menu for some bedtime reading, but seriously the Pdf version works well if you want a paper copy of the SongKong manual.
Fix Songs
But despite what I say at the start of this post we have made some improvements to FixSongs as well, these include some major performance improvements based on improvements we made in Jaikoz 8.
Full list of improvements and fixes can be seen 
here