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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE chapter
[
<!ENTITY images "images">
<!ENTITY backwardIcon "../&images;/adwaita/media-skip-backward.png">
<!ENTITY previousIcon "../&images;/adwaita/media-seek-backward.png">
<!ENTITY playIcon "../&images;/adwaita/media-playback-start.png">
<!ENTITY stopIcon "../&images;/adwaita/media-playback-stop.png">
<!ENTITY nextIcon "../&images;/adwaita/media-seek-forward.png">
<!ENTITY forwardIcon "../&images;/adwaita/media-skip-forward.png">
]>
<!-- Copyright (C) 2005-2018 Jo\u00EBl Kr\u00E4hemann -->
<!-- Permission is granted to copy, distribute and/or modify this document -->
<!-- under the terms of the GNU Free Documentation License, Version 1.3 -->
<!-- or any later version published by the Free Software Foundation; -->
<!-- with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. -->
<!-- A copy of the license is included in the section entitled "GNU -->
<!-- Free Documentation License". -->
<chapter xmlns="http://docbook.org/ns/docbook" version="5.0">
<title>The navigation</title>
<mediaobject>
<imageobject>
<imagedata width="100%" scalefit="1" fileref="../&images;/ags_navigation.png" format="PNG" />
</imageobject>
<caption>
<para>
The navigation screenshot
</para>
</caption>
</mediaobject>
<para>
With the navigation you have overall control of your song. Settings you perform
here may influence the behaviour of AGS. There's a duration label doing a time approximation.
It is really unreliable and may differ about 30 seconds after 3 minutes of playback. Note
with higher frequency of the audio related threads it may differ less. An other factor is bpm
what has an influence, as well.
</para>
<sect1>
<title>BPM</title>
<para>
The beats per minute (BPM for short) indicates the velocity of a song being
played. To adjust the BPM of the project in-/decrement the spinner labeled
with bpm. To edit patterns or notes at a more granular rate select the wished
tact within the appropriate engine or editor.
</para>
<para>
To calculate timings you divide 1 minute with the entered BPM and divide it
with basic. For example you have a BPM rate of 120 and a 4/4 tact you would
calculate the timing as follow:
</para>
<equation>
<mathphrase>t = 1 / 120 * (1 / 4)</mathphrase>
</equation>
</sect1>
<sect1>
<title>Playback controls</title>
<para>
With these controls you can play/stop a song or seek to the wished position.
</para>
<table>
<title>AGS playback controls table</title>
<tgroup cols="3" align="left" colsep='1' rowsep='1'>
<colspec colnum="1" colname="col1" colwidth="1*"/>
<colspec colnum="2" colname="col2" colwidth="2*"/>
<colspec colnum="3" colname="col3" colwidth="4.5*"/>
<thead>
<row>
<entry>icon</entry>
<entry>action</entry>
<entry>description</entry>
</row>
</thead>
<tbody>
<row>
<entry><imagedata fileref="&backwardIcon;" format="PNG" width="1em" /></entry>
<entry>backward</entry>
<entry>Seeking back until it's pressed again.</entry>
</row>
<row>
<entry><imagedata fileref="&previousIcon;" format="PNG" width="1em" /></entry>
<entry>previous</entry>
<entry>Seeking back until it's not pressed anymore.</entry>
</row>
<row>
<entry><imagedata fileref="&playIcon;" format="PNG" width="1em" /></entry>
<entry>play</entry>
<entry>Starts the engines and the piano roll.</entry>
</row>
<row>
<entry><imagedata fileref="&stopIcon;" format="PNG" width="1em" /></entry>
<entry>stop</entry>
<entry>Stops the engines and the piano roll.</entry>
</row>
<row>
<entry><imagedata fileref="&nextIcon;" format="PNG" width="1em" /></entry>
<entry>next</entry>
<entry>Seeking forward until it's not pressed anymore.</entry>
</row>
<row>
<entry><imagedata fileref="&forwardIcon;" format="PNG" width="1em" /></entry>
<entry>forward</entry>
<entry>Seeking forward until it's pressed again.</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
The loop checkbox enables the loop L and loop R settings below. It causes the notation to loop playback.
Auto-Scroll checkbox animates the horizontal scrollbars to follow playback position. Use exclude sequencers
checkbox to enable/disable pattern based sequencers.
</para>
</sect1>
</chapter>
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