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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11719 a1c6a512-1295-4272-9138-f99709370657

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diff --git a/apps/codecs/dumb/docs/modplug.txt b/apps/codecs/dumb/docs/modplug.txt
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-/*  _______         ____    __         ___    ___
- * \    _  \       \    /  \  /       \   \  /   /       '   '  '
- *  |  | \  \       |  |    ||         |   \/   |         .      .
- *  |  |  |  |      |  |    ||         ||\  /|  |
- *  |  |  |  |      |  |    ||         || \/ |  |         '  '  '
- *  |  |  |  |      |  |    ||         ||    |  |         .      .
- *  |  |_/  /        \  \__//          ||    |  |
- * /_______/ynamic    \____/niversal  /__\  /____\usic   /|  .  . ibliotheque
- *                                                      /  \
- *                                                     / .  \
- * modplug.txt - Our official position regarding      / / \  \
- *               compatibility with ModPlug          | <  /   \_
- *               Tracker.                            |  \/ /\   /
- *                                                    \_  /  > /
- *                                                      | \ / /
- *                                                      |  ' /
- *                                                       \__/
- */
-
-
-********************
-*** Introduction ***
-********************
-
-ModPlug Tracker is a very popular tracker for Windows. Its popularity is due
-to the intuitive interface and its many advanced features. The author has
-done a good job with this piece of software, but sadly in doing so he has
-desecrated the IT file format.
-
-I am not against ModPlug Tracker being used to write music modules. As
-already stated, it has some very advanced and convenient features; I use it
-myself. However, I believe its users should be aware of the entire situation
-before using it for any serious work.
-
-   ModPlug Tracker - http://www.modplug.com/
-
-
-*************************
-*** Incompatibilities ***
-*************************
-
-There are a few situations in which ModPlug Tracker misinterprets the
-original module formats. I shall list the five I am most aware of, from least
-to most annoying:
-
-5. Create a multisample instrument, for example a piano. Play a low note.
-   Then go up the scale, but in the pattern data, make sure the instrument
-   column is blank; put in only the notes. Play this with ModPlug Tracker,
-   and play it with Impulse Tracker. Impulse Tracker changes sample as you go
-   up the scale; ModPlug Tracker does not.
-
-4. Arpeggio and Retrigger Note effects behave badly when combined with
-   Portamento, which can appear in the volume column. While Retrigger Note
-   isn't too bad, Arpeggio sounds completely wrong. Try it and see what
-   happens. Then repeat the experiment in Impulse Tracker.
-
-3. The filter algorithm is incorrect, in more ways than one. When Jeffrey Lim
-   programmed the low-pass resonant filters into Impulse Tracker, he used a
-   standard filter algorithm with a slight modification to achieve greater
-   resonance. ModPlug Tracker does not incorporate this modification.
-   Furthermore, ModPlug Tracker uses integer arithmetic with nowhere near
-   enough precision; the wave output is really poor in some cases. I don't
-   doubt it damages the acoustic properties of the filters in subtle ways.
-
-2. When looping, ModPlug Tracker resets all variables. The original trackers
-   do not do this.
-
-1. Worst of all, ModPlug Tracker has no regard for playback volume, and
-   generally has a much lower output level than the original trackers.
-
-Cases 3, 2 and 1 lead people to write IT files that play badly in the
-original trackers. If some of these problems could be fixed, I'd be all for
-it - but these problems have been reported to the author and he had no
-motivation to fix them. ModPlug Tracker has been around long enough that
-fixing 3, 2 and 1 would be detrimental to too many people's music.
-
-
-******************
-*** Extensions ***
-******************
-
-Worse than the incompatibilities are the extensions ModPlug Tracker makes,
-mostly to the IT format. DUMB currently supports one of these extensions,
-namely stereo samples, but supporting the others is not high on my list of
-priorities.
-
-Other extensions ModPlug Tracker has provided mostly take the form of extra
-effects. For instance, S98 and S99 can be used to enable or disable reverb. I
-believe the latest versions of ModPlug Tracker offer alternative types of
-filter, such as high-pass and band-pass. As soon as an IT file uses any of
-these features, it will play incorrectly with Impulse Tracker.
-
-By far the most evil extension provided by ModPlug Tracker is the effect
-plug-ins. These enable IT files to use VST effects. I recently downloaded an
-IT file that uses some effects from a collection named "DirectX Media Audio
-Effects". When can we expect these effects to be ported to Linux?
-
-
-******************
-*** Conclusion ***
-******************
-
-ModPlug Tracker is trying to be two things at once. It wants to be an editor
-for the existing formats, but at the same time it wants to be proprietary,
-with all its own features and extensions. Unfortunately it is succeeding;
-there are many IT files out there that only play right in ModPlug Tracker. In
-my opinion, ModPlug Tracker should have come out with its own file format, in
-which all these extensions would have found a home.
-
-If you are going to use ModPlug Tracker's extensions, I recommend you
-ultimately convert your music to a streamed format such as Ogg Vorbis. (If
-you were thinking of using MP3, then don't - consider using Ogg Vorbis
-instead.) If you release IT files that use ModPlug Tracker's extensions,
-please state prominently that the files are designed to be played with
-ModPlug Tracker. Finally, don't ask me to support ModPlug Tracker's
-extensions; ModPlug Tracker's playback code is available for use in your
-games, so use that instead.
-
-   Ogg Vorbis - http://www.vorbis.com/
-
-Despite all the above problems, don't forget that ModPlug Tracker does have a
-lot of very useful features for editing files. These include a function for
-removing unused patterns, samples and instruments, drag-and-drop sample and
-instrument ripping, drop-down menus for selecting the effects by name without
-having to memorise the codes or refer to help, and lots of other nice things.
-I do recommend it as an editor, provided you make sure you are aware of the
-situation and do not use ModPlug Tracker's extensions or incompatibilities
-inadvertently.
-
-Oh, and by the way, save your final version with Impulse Tracker. Then the
-samples will be compressed for you!
-
-
-Ben Davis
-entheh@users.sf.net
-IRC EFnet #dumb
-See readme.txt for details on using IRC.