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<TITLE>T_STATEMENT</TITLE>
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<H2>T STATEMENT (TEMPO STATEMENT)</H2>
<PRE><TT> <B>t</B> p1 p2 p3 p4 ..... (unlimited) </TT>
</PRE>
<P>
<HR></P>
<H4><U>DESCRIPTION</U></H4>
<P>This statement sets the tempo and specifies the accelerations and decelerations
for the current section. This is done by converting beats into seconds.
</P>
<H4><U>PFIELDS </U></H4>
<PRE><TT> p1 must be zero
p2 initial tempo in beats per minute
p3, p5, p7, ... times in beats (in non-decreasing order)
p4, p6, p8, ... tempi for the referenced beat times </TT>
</PRE>
<H4><U>SPECIAL CONSIDERATIONS </U></H4>
<P>Time and Tempo-for-that-time are given as ordered couples that define
points on a "tempo vs time" graph. (The time-axis here is in
beats so is not necessarily linear.) The beat-rate of a Section can be
thought of as a movement from point to point on that graph: motion between
two points of equal height signifies constant tempo, while motion between
two points of unequal height will cause an accelarando or ritardando accordingly.
The graph can contain discontinuities: two points given equal times but
different tempi will cause an immediate tempo change. </P>
<P>Motion between different tempos over non-zero time is inverse linear.
That is, an accelerando between two tempos M1 and M2 proceeds by linear
interpolation of the single-beat durations from 60/M1 to 60/M2. </P>
<P>The first tempo given must be for beat 0. </P>
<P>A tempo, once assigned, will remain in effect from that time-point unless
influenced by a succeeding tempo, i.e. the last specified tempo will be
held to the end of the section. </P>
<P>A <B>t</B> statement applies only to the score section in which it appears.
Only one <B>t</B> statement is meaningful in a section; it can be placed
anywhere within that section. If a score section contains no <B>t</B> statement,
then beats are interpreted as seconds (i.e. with an implicit <B>t 0 60</B>
statement). </P>
<P>N.B. If the <B>csound</B> command includes a <B><A HREF="./../Command/CSCOMM.html">-t
flag</A></B>, the interpreted tempo of all score <B>t</B> statements will
be overridden by the command-line tempo. </P>
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