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<TITLE>Automatic Melodies: Aria Tracks</TITLE>
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<H1><A NAME="SECTION001100000000000000000"></A>
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<A NAME="chap-aria"></A>
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<BR>
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Automatic Melodies: Aria Tracks
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</H1>
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<P>
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A<SMALL>RIA</SMALL> tracks are designed to let
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> automatically generate
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something resembling melody. Honest, this will never put real
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composers on the unemployment line (well, no more than they are mostly
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there already).
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<P>
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You might want to use an A<SMALL>RIA</SMALL> to embellish a section of a song (like
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an introduction or an ending). Or you can have
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> generate a complete
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melody over the song chords.
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<P>
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In a traditional song the melody depends on two parts: patterns
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(IE. note lengths, volume, articulation) and pitch (usually determined
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by the chords in a song). If you have been using
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> at all you will
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know that that chords are the building block of what
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> does
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already. So, to generate a melody we just need some kind of
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pattern. And, since
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> already uses patterns in most things it
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does, it is a short step to use a specialized pattern to generate a
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melody.
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<P>
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It might serve to look at the sample song files enclosed in this
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package in the directory <TT><SPAN CLASS="textbf">egs/aria</SPAN></TT>. Compile and play them. Not too bad?
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<P>
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Just like other track, you can create as many A<SMALL>RIA</SMALL>s as you
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want. So, you can have the tracks A<SMALL>RIA-1</SMALL>, A<SMALL>RIA</SMALL>, and
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A<SMALL>RIA-SILLY</SMALL> all at the same time. And, the majority of other
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commands (like O<SMALL>CTAVE</SMALL>, A<SMALL>RTICULATE</SMALL>, etc.) apply to A<SMALL>RIA</SMALL>s.
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<P>
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The following commands are important to note:
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<P>
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<DL>
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<DT><STRONG>Range</STRONG></DT>
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<DD>Just like scale tracks. A R<SMALL>ANGE</SMALL> of 2 would let
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> work on a 2
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octave chord, etc.
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<P>
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</DD>
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<DT><STRONG>ScaleType</STRONG></DT>
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<DD>Much like a scale track. By default, the setting for this
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is CHORD. But, you can use AUTO, SCALE or CHROMATIC. AUTO and SCALE
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are identical and force
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> to select notes from the scale associated
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with the current chord; CHROMATIC generates an 11 tone scale starting
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at the root note of the chord.
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<P>
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</DD>
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<DT><STRONG>Direction</STRONG></DT>
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<DD>As
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> processes the song it moves a note-selection pointer
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up or down. By default D<SMALL>IRECTION</SMALL> is set to the single value "1" which
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tells
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> to add 1 after each note is generated. However, you can set
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the value to an integer -4 to 4 or the special value "r". With "r" a
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random value -1, 0 or 1 will be used. Important: in an A<SMALL>RIA</SMALL>
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track the sequence size/point is ignored for D<SMALL>IRECTION</SMALL>.
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<P>
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</DD>
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</DL>
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<P>
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A bit more detail on defining an A<SMALL>RIA</SMALL>:
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<P>
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First, here is a simplified sample track definition:
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<P>
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<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
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<tr><td>
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<B>Begin Aria
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<BR>
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Voice JazzGuitar
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<BR>
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Volume f
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<BR>
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Sequence 1.5 8 90; 2 8 90; 2.5 8 90;
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<BR>
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3 8 90; 3.5 8 90; 4 8 90; 4.5 8 90
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<BR>
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Direction r 0 0 1 -1 0 0 1 r
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</B>
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</td></tr>
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</Table>
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<P>
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Next assume that we have a few bars of music with only a CMajor
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chord the default R<SMALL>ANGE</SMALL> of ``1'' and the default S<SMALL>CALE</SMALL>T<SMALL>YPE</SMALL>
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of ``Scale'. The following table shows the notes which would be generated
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for each time event:
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<P>
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<BLOCKQUOTE>
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<TABLE CELLPADDING=3 BORDER="1">
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<TR><TD ALIGN="LEFT">Event</TD>
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<TD ALIGN="LEFT">Offset Pointer</TD>
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<TD ALIGN="LEFT">Note</TD>
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</TR>
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<TR><TD ALIGN="LEFT">1</TD>
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<TD ALIGN="LEFT">0</TD>
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<TD ALIGN="LEFT">c</TD>
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</TR>
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<TR><TD ALIGN="LEFT">2</TD>
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<TD ALIGN="LEFT">0</TD>
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<TD ALIGN="LEFT">c</TD>
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</TR>
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<TR><TD ALIGN="LEFT">3</TD>
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<TD ALIGN="LEFT">1</TD>
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<TD ALIGN="LEFT">e</TD>
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</TR>
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<TR><TD ALIGN="LEFT">4</TD>
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<TD ALIGN="LEFT">3 <SPAN CLASS="MATH"><IMG
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WIDTH="24" HEIGHT="19" ALIGN="BOTTOM" BORDER="0"
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SRC="img5.png"
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ALT="$\Rightarrow$"></SPAN> 0</TD>
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<TD ALIGN="LEFT">c</TD>
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</TR>
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<TR><TD ALIGN="LEFT">5</TD>
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<TD ALIGN="LEFT">4 <SPAN CLASS="MATH"><IMG
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WIDTH="24" HEIGHT="19" ALIGN="BOTTOM" BORDER="0"
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SRC="img5.png"
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ALT="$\Rightarrow$"></SPAN> 0</TD>
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<TD ALIGN="LEFT">c</TD>
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</TR>
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<TR><TD ALIGN="LEFT">6</TD>
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<TD ALIGN="LEFT">-2 <SPAN CLASS="MATH"><IMG
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WIDTH="24" HEIGHT="19" ALIGN="BOTTOM" BORDER="0"
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SRC="img5.png"
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ALT="$\Rightarrow$"></SPAN> 2</TD>
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<TD ALIGN="LEFT">g</TD>
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</TR>
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<TR><TD ALIGN="LEFT">7</TD>
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<TD ALIGN="LEFT">random</TD>
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<TD ALIGN="LEFT">c, e or g</TD>
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</TR>
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<TR><TD ALIGN="LEFT">8</TD>
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<TD ALIGN="LEFT">random</TD>
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<TD ALIGN="LEFT">c, e, or g</TD>
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</TR>
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<TR><TD ALIGN="LEFT">9</TD>
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<TD ALIGN="LEFT">....</TD>
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<TD ALIGN="LEFT">etc.</TD>
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</TR>
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</TABLE>
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</BLOCKQUOTE>
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<P>
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In the above table the ``<SPAN CLASS="MATH"><IMG
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WIDTH="24" HEIGHT="19" ALIGN="BOTTOM" BORDER="0"
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SRC="img5.png"
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ALT="$\Rightarrow$"></SPAN>'' indicates that the offset is
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out-of-range and converted to the second value.
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<P>
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If you were to change the S<SMALL>CALE</SMALL>T<SMALL>YPE</SMALL> or R<SMALL>ANGE</SMALL> you would get a
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completely different series.
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<P>
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Please note the following:
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<P>
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<UL>
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<LI>A<SMALL>RIA</SMALL>s are <SPAN CLASS="textit">not</SPAN> saved or modified by G<SMALL>ROOVE</SMALL> commands. Well, almost
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...the sequence size will be adjusted to match the new size from the
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groove. This might be unexpected:
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<P>
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<UL>
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<LI>Load a groove. Let's say it has a S<SMALL>EQSIZE</SMALL> of 4.
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</LI>
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<LI>Create an A<SMALL>RIA</SMALL>. Use 4 patterns to match the groove size (if you
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don't
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> will expand the sequence size for the A<SMALL>RIA</SMALL>, just
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like other tracks).
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</LI>
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<LI>Process a few bars of music.
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</LI>
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<LI>Load a new groove, but this time with a S<SMALL>EQSIZE</SMALL> of 2. Now, the
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A<SMALL>RIA</SMALL> will be truncated. This behavior is duplicated in other
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tracks as well, but it might be unexpected here.
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</LI>
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</UL>
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<P>
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</LI>
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<LI>D<SMALL>IRECTION</SMALL> can not be changed on a bar per bar basis. It applies to
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the entire sequence.
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<P>
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</LI>
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</UL>
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<P>
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You can make dramatic changes to your songs with a few simple
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tricks. Try modifying the D<SMALL>IRECTION</SMALL> settings just slightly; use
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several patterns and S<SMALL>EQ</SMALL>R<SMALL>ND</SMALL> to generate less predictable
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patterns; use H<SMALL>ARMONLY</SMALL>O<SMALL>NLY</SMALL> with a different voice and pattern.
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<P>
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Oh, and have fun!
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<P>
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<P>
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bob
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2008-09-28
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