Next todo list item done - seeking works! I've implementd it for audiotestsrc and the gstbml plugin. This means two things: first we now get the EOS (end of stream) for generated data too and second we can play loops again.
I've also extended the GUI a little. You can now move the loop-start/end around by holding ctrl/alt while clicking in the position column of the sequence. Need to add keyboard-shortcuts for it still. Loops are also loaded from and stored in song-files now.
While also doing some cleaups in the sources and removing cruft I was able to fix some GUI deadlocks. Never paint to widgets that are now shown ;).
Looks like we can finally approach new thing for the next month, like writing a simple synth plugin for gstreamer, that is able to play real notes.
help: One blocker in buzztard right now is that we have no proper widgets to edit patterns. We've started to write down requirements in our wiki. If anyone feels like contributing his gtk-widget writing skills to our project - you are very welcome! Emails us (see sf.net site) or meet us in the buzztard irc channel or the gstreamer irc channel