From homepage: This version fixes some critical bugs and should have been out much sooner. Unfortunately I was very busy working my normal job. I’m sorry for anyone that was affected by one of the bugs in SIDPLAY 4.0.

I’m planning to update more often from now on, but bear with me if my time schedule becomes tight again.

Changelog:

• Added Growl notification support.
• Fixed playback on multi-channel sound devices.
• Added detection of sound device change.
• Fixed potential data-loss problem when syncing collection.
• Added fixes to emulation to allow playback of songs such as “Fanta in Space”.
• Fixed error handling when loading a tune from a URL.
• Fixed crash when syncing while spotlight search is in progress.
• Added possibility to select subtune when exporting a song.
• Fixed a case where songs were exported with the wrong length.
• Added option to select fadeout time when exporting songs.
• Playlists can now contain the same file more than once.
• Dragging a playlist item to a different playlist now retains the selected subtune.
• Fixed bug in browser navigation history.
• The “Select Song” submenu now shows all available subtunes.
• Fixed updating of exported file size when changing time.
• Editing smart playlist criteria now immediately updates the smart playlist as you type.
• Playing the next item in a playlist now works correctly in any sort order.
• Changing the sorting of a view keeps the selection intact.
• Pasting a path string into the browser view jumps to that location.
• Removed all traces of Carbon code.
• Other minor bug fixes and improvements.

source: sidmusic.org