The "cursor-moves-while-playing" flag is with-tracking-cursor. It defaults to false currently -- perhaps I should change that. You can set it in the preferences dialog (under "Cursor", "track current location while playing"), or via (set! (with-tracking-cursor) #t). I've used about a half dozen names for this over the years -- the word "track" has so many meanings in computer music that I have tried to avoid it. I've added an easy way to play the selection looped (in the current daily tarball or the CVS sources). In older versions, if you have the context-sensitive menus loaded, right click in the selection, and choose "Loop play". Otherwise you need to run the code that performs that operation (see popup.scm). But as I say, it's easier now in the new Snd version. There's also an arrow for "play from the cursor". The preferences dialog complaint that a module isn't loaded is harder to fix because you can run different versions of Snd, and the dialog is tailored to whatever is currently loaded, but saves the preferences in some file like ~/.snd_prefs_s7 which is loaded by any version. The complaint itself arises because you're asking for some feature that depends on a module (the Gtk/Motif bindings for example) that isn't loaded in the Snd you're currently running, and that can't be found as a run-time loadable library. I think I'll change the dialog to provide settings only for stuff that is always available. (And I'll move a lot of that stuff into the basic Snd).