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<div class="refentry" title="timedseq">
<a id="timedseq"></a>
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<a id="IndexTimedSeq" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">timedseq</span>
</h2>
<p>timedseq —
Time Variant Sequencer
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp48805504"></a>
<h2>Description</h2>
<p>
An event-sequencer in which time can be controlled by a
time-pointer. Sequence data are stored into a table.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp48806224"></a>
<h2>Syntax</h2>
<pre class="synopsis">ktrig <span class="command"><strong>timedseq</strong></span> ktimpnt, ifn, kp1 [,kp2, kp3, ...,kpN]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp48814440"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- number of table containing sequence
data.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp48815296"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktri</em></span> -- output trigger signal
</p>
<p>
<span class="emphasis"><em>ktimpnt</em></span> -- time pointer into sequence file, in seconds.
</p>
<p>
<span class="emphasis"><em>kp1,...,kpN</em></span> -- output p-fields of notes. kp2
meaning is relative action time and kp3 is the duration of notes
in seconds.
</p>
<p>
<span class="emphasis"><em>timedseq</em></span> is a sequencer that allows to schedule
notes starting from a user sequence, and depending from an external
timing given by a time-pointer value (ktimpnt argument). User should
fill table ifn with a list of notes, that can be provided in an
external text file by using GEN23, or by typing it directly in the
orchestra (or score) file with GEN02. The format of the text file
containing the sequence is made up simply by rows containing several
numbers separated by space (similarly to normal Csound score). The
first value of each row must be a positive or null value, except for a
special case that will be explained below. This first value is
normally used to define the instrument number corresponding to that
particular note (like normal score). The second value of each row must
contain the action time of corresponding note and the third value its
duration. This is an example:
</p>
<pre class="programlisting">
0 0 0.25 1 93
0 0.25 0.25 2 63
0 0.5 0.25 3 91
0 0.75 0.25 4 70
0 1 0.25 5 83
0 1.25 0.25 6 75
0 1.5 0.25 7 78
0 1.75 0.25 8 78
0 2 0.25 9 83
0 2.25 0.25 10 70
0 2.5 0.25 11 54
0 2.75 0.25 12 80
-1 3 -1 -1 -1 ;; last row of the sequence
</pre>
<p>
In this example, the first value of each row is always zero (it is a
dummy value, but this p-field can be used, for example, to express a
MIDI channel or an instrument number), except the last row, that
begins with -1. This value (-1) is a special value, that indicates the
end of sequence. It has itself an action time, because sequences can be
looped. So the previous sequence has a default duration of 3 seconds,
being value 3 the last action time of the sequence.
</p>
<p>
It is important that ALL lines contains the same number of values (in
the example all rows contains exactly 5 values). The number of values
contained by each row, MUST be the number of kpXX output arguments
(notice that, even if kp1, kp2 etc. are placed at the right of the
opcode, they are output arguments, not input arguments).
</p>
<p>
ktimpnt argument provide the real temporization of the
sequence. Actually the passage of time through sequence is specified
by ktimpnt itself, which represents the time in seconds. ktimpnt must
always be positive, but can move forwards or backwards in time, be
stationary or discontinuous, as a pointer into the sequence file, in
the same way of pvoc or lpread. When ktimpnt crosses the action time
of a note, a trigger signal is sent to ktrig output argument, and kp1,
kp2,...kpN arguments are updated with the values of that note. This
information can then be used with schedkwhen to actually
activate note events. Notice that kp1,...kpn data can be further
processed (for example delayed with delayk, transposed, etc.) before
feeding schedkwhen.
</p>
<p>
<span class="emphasis"><em>ktimpnt</em></span> can be controlled by a linear signal, for example:
</p>
<pre class="programlisting">
ktimpnt <span class="opc">line</span> 0, p3, 3 <span class="comment">; original sequence duration was 3 secs</span>
ktrig <span class="opc">timedseq</span> ktimpnt, 1, kp1, kp2, kp3, kp4, kp5
<span class="opc">schedkwhen</span> ktrig, 105, 2, 0, kp3, kp4, kp5</pre>
<p>
in this case the complete sequence (with original duration of 3
seconds) will be played in <span class="emphasis"><em>p3</em></span> seconds.
</p>
<p>
You can loop a sequence by controlling it with a phasor:
</p>
<pre class="programlisting">
kphs <span class="opc">phasor</span> 1<span class="op">/</span>3
ktimpnt <span class="op">=</span> kphs <span class="op">*</span> 3
ktrig <span class="opc">timedseq</span> ktimpnt ,1 ,kp1, kp2, kp3, kp4, kp5
<span class="opc">schedkwhen</span> ktrig, 105, 2, 0, kp3, kp4, kp5</pre>
<p>
</p>
<p>
Obviously you can play only a fragment of the sequence, read it
backward, and non-linearly access sequence data in the same way of
pvoc and lpread opcodes.
</p>
<p>
With timedseq opcode you can do almost all things of a normal score,
except you have the following limitations:
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p>You can't have two notes exactly starting with the same action
time; actually at least a k-cycle should separate timing of two
notes (otherwise the schedkwhen mechanism eats one of them).</p>
</li>
<li class="listitem">
<p>All notes of the sequence must have the same number of p-fields
(even if they activate different instruments).</p>
</li>
</ol>
</div>
<p>
You can remedy this limitation by filling with dummy values notes that belongs to
instruments with less p-fields than other ones.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp48887992"></a>
<h2>Examples</h2>
<p>
Here is a complete example of the timedseq opcode. It uses the file <a class="ulink" href="examples/timedseq.csd" target="_top"><em class="citetitle">timedseq.csd</em></a>.
</p>
<div class="example">
<a id="idp48888984"></a>
<p class="title">
<strong>Example 879. Example of the timedseq opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o timedseq.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
giseq <span class="ohdr">ftgen</span> 0,0,128,<span class="op">-</span>2, 2, 0, 0.5, 8.00,\ <span class="comment">;first note</span>
2, 1, 0.5, 8.02,\ <span class="comment">;second note</span>
2, 2, 0.5, 8.04,\ <span class="comment">;third</span>
2, 3, 0.5, 8.05,\ <span class="comment">;fourth</span>
2, 4, 0.5, 8.07,\ <span class="comment">;fifth</span>
2, 5, 0.5, 8.09,\ <span class="comment">;sixth</span>
2, 6, 0.5, 8.11,\ <span class="comment">;seventh</span>
2, 7, 0.5, 9.00,\ <span class="comment">;eight note</span>
2, 8, 0.5, 8.00,\ <span class="comment">;due to a quirk in the opcode, it needs an extra note - a copy of the first note</span>
<span class="op">-</span>1, 8, <span class="op">-</span>1, <span class="op">-</span>1 <span class="comment">;last line is a dummy event that indicates to timedseq when to loop back to the beginning</span>
<span class="oblock">instr</span> 1
ibeats <span class="op">=</span> 8 <span class="comment">;lengths of sequence in beats</span>
itempo <span class="op">=</span> p4 <span class="comment">;tempo</span>
iBPS <span class="op">=</span> itempo<span class="op">/</span>60 <span class="comment">;beats per second </span>
kphase <span class="opc">phasor</span> iBPS<span class="op">/</span>ibeats <span class="comment">;phasor to move through table</span>
kpointer <span class="op">=</span> kphase<span class="op">*</span>ibeats <span class="comment">;multiply phase (range 0 - 1) by the number of beats contained within the sequence</span>
kp1 <span class="opc">init</span> 0
kp2 <span class="opc">init</span> 0
kp3 <span class="opc">init</span> 0
kp4 <span class="opc">init</span> 0
ktrigger <span class="opc">timedseq</span> kpointer, giseq, kp1, kp2,kp3, kp4
<span class="opc">schedkwhen</span> ktrigger, 0, 0, 2, 0, kp3<span class="op">/</span><span class="opc">abs</span>(iBPS), kp4 <span class="comment">;p3 values have been scaled according to tempo so that they maesure beats rather than seconds</span>
<span class="oblock">endin</span> <span class="comment">;abs(iBPS)(absolute value) is used because the tempo provided by the fourth note of the score is negative.</span>
<span class="comment">;Durations here should be positive, because negative values for duration would indicate a held note.</span>
<span class="oblock">instr</span> 2
aenv <span class="opc">linseg</span> 0,0.01,1,p3<span class="op">-</span>0.01,0 <span class="comment">;amplitude envelope</span>
asig <span class="opc">vco2</span> 0.4, <span class="opc">cpspch</span>(p4), 4, 0.5
<span class="opc">outs</span> asig<span class="op">*</span>aenv, asig<span class="op">*</span>aenv
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 4 120
<span class="stamnt">i</span> 1 + . 240
<span class="stamnt">i</span> 1 + . 480
<span class="stamnt">i</span> 1 + . -480 <span class="comment">;when negative it plays backwards </span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp48891264"></a>
<h2>See Also</h2>
<p>
<a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>,
<a class="link" href="GEN23.html" title="GEN23"><em class="citetitle">GEN23</em></a>,
<a class="link" href="seqtime.html" title="seqtime"><em class="citetitle">seqtime</em></a>,
<a class="link" href="seqtime.html" title="seqtime"><em class="citetitle">seqtime2</em></a>,
<a class="link" href="trigseq.html" title="trigseq"><em class="citetitle">trigseq</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp48894200"></a>
<h2>Credits</h2>
<p>
Author: Gabriel Maldonado
</p>
</div>
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