README: Add info about simultaneous speech and subtitles in SCI games

README

@@ -33,7 +33,8 @@ Table of Contents:
  * 3.17 Winnie the Pooh notes
  * 3.18 Troll's Tale notes
  * 3.19 Dragon History notes
- * 3.20 Known Problems
+ * 3.20 Simultaneous speech and subtitles in Sierra SCI games
+ * 3.21 Known Problems
 4.0) Supported Platforms
 5.0) Running ScummVM
  * 5.1 Command Line Options
@@ -815,7 +816,57 @@ All game files and the walkthrough can be downloaded from
 http://www.ucw.cz/draci-historie/index-en.html
 
 
-3.20) Known Problems:
+3.20) Simultaneous speech and subtitles in Sierra SCI games:
+----- ------------------------------------------------------
+Certain CD versions of Sierra SCI games had both speech and text
+resources. Some have an option to toggle between the two, but there are
+some cases where there wasn't any option to enable both simultaneously.
+In ScummVM, it is possible to enjoy a combined mode, where both speech
+and text are shown at the same time. This mode can be toggled in the
+ScummVM audio options, but each game has different behavior in-game
+regarding speech and text toggling.
+
+The CD games where speech and subtitles can be shown simultaneously
+are:
+  EcoQuest 1 CD
+  Freddy Pharkas CD
+  King's Quest 6 CD
+  Laura Bow 2 CD
+  Leisure Suit Larry 6 CD
+  Space Quest 4 CD
+
+EcoQuest 1 CD:
+    Speech and text can be toggled via the game's "Mode" option in the
+    options dialog, or via ScummVM's audio options.
+
+Freddy Pharkas CD:
+    There is no in-game option to toggle speech and text. Only ScummM's
+    audio options can be used to toggle this feature. Note that some
+    spoken dialog is missing from the game texts.
+
+King's Quest 6 CD
+    There is no in-game option to toggle simultaneous speech and text.
+    Either speech or text can be selected individually, but not
+    simultaneously. Only ScummM's audio options can be used to enable
+    both simultaneously.
+
+Laura Bow 2 CD
+    There is no in-game option to toggle simultaneous speech and text.
+    Either speech or text can be selected individually, but not
+    simultaneously. Only ScummM's audio options can be used to enable
+    both simultaneously.
+
+Leisure Suit Larry 6 CD
+    There is no in-game option to toggle text only. Either speech only
+    or speech and text can be selected. Only ScummM's audio options can
+    be used to enable the text only mode.
+
+Space Quest 4 CD:
+    Speech and text can be toggled via the "Display Mode" button in the
+    options dialog, or via ScummVM's audio options.
+
+
+3.21) Known Problems:
 ----- ---------------
 This release has the following known problems. There is no need to
 report them, although patches to fix them are welcome. If you discover a