I see from one of the earlier posts that the move to MP3 degraded some of the songs (Bushtit and Cedar Waxwing are two that come to mind), but that you are working with CLO to fix this.

Could you also consider expanding the song collection to include more calls? The recording for Swainson's Thrush misses the "foo-whit"-like whistle which I commonly hear either on its own or with the song.

There are a number of higher-pitched songs that sound fine in v3.5 and sound worse in v3.9

We are fixing this with a free update -- v3.9.6 should be ready in late December 2008.