[CM] snd: x-zoom and :track-and-return cursor

[Bill Schottstaedt]

I think the first (tracking cursor) problem is that in snd-dac.c line 1142,
I should use

	  if ((with_tracking_cursor(ss) != DONT_TRACK) &&

not ss->tracking because the tracking flag is only on after the
DAC is started.

	  sp->playing++;
	  if ((with_tracking_cursor(ss) != DONT_TRACK) &&
	      (!(is_player_sound(sp))))
	    {
	      cp->original_cursor = cursor_sample(cp);
	      if (cp->axis)

I wonder how many more of these are floating around -- I'll try to
search systematically this afternoon.