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+Game Data
+---------
+gzdoom is only a game engine. To actually play the game, you'll need the
+game data (IWAD file) from one or more of the supported games. These
+include Doom, Ultimate Doom, Final Doom, FreeDoom, Heretic, Hexen,
+and Strife.  Place the .wad file(s) in /usr/share/games/doom.
+
+If you don't own any of the supported games, you can install one or more
+of these slackbuilds.org packages to get a playable game:
+
+- freedoom
+- doom_shareware_data
+- heretic_shareware_data
+- hexen_demo_data
+- chexquest3
+
+Sound Backend
+-------------
+The default sound backend is FMOD. If OpenAL was found when the package
+was built, it can be used instead of FMOD. From the main menu:
+
+Options -> Sound Options -> Sound Backend.
+
+If you have issues with positional audio, try switching to OpenAL. However,
+some mods (notably Brutal Doom) require FMOD for correct audio support.
+Unfortunately there are probably some other mods that only work with
+OpenAL :(
+
+If you use FMOD, set "FMOD Options -> Output System" to either "ALSA"
+or "PulseAudio". Otherwise, the default is OSS emulation, which doesn't
+share the soundcard nicely with other apps.
+
+Music Support
+-------------
+To hear the in-game music, there are several options. In the game menu,
+select "Options | Sound Options" and set "MIDI Device" to one of the
+below:
+
+1. FMOD (the default) - Install ff8dls and set the console variable
+snd_midipatchset to "/usr/share/sounds/dls/ff8.dls" (from the in-game
+console or by editing ~/.config/gzdoom/zdoom.ini). Alternatively,
+if you dual-boot with Windows, use something like
+/dosC/windows/system32/drivers/gm.dls (replace dosC with the mountpoint
+of your C: drive in Windows).
+
+2. FluidSynth - Install fluidsynth (before building gzdoom) and
+fluid-soundfont.
+
+3. Timidity - Install TiMidity++ and either eawpats or freepats, and
+set up /etc/timidity/timidity.cfg to use it.
+
+4. GUS or OPL - Nothing extra required; these are software emulations
+of classic soundcards from the early 1990s. They may sound "clunky" to
+modern ears, but they may also bring back fond memories for long-time
+Doom players.