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<h2>
<span class="refentrytitle">event</span>
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<p>event —
Generates a score event from an instrument.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp19358896"></a>
<h2>Description</h2>
<p>
Generates a score event from an instrument.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp19366776"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>event</strong></span> "scorechar", kinsnum, kdelay, kdur, [, kp4] [, kp5] [, ...]</pre>
<pre class="synopsis"><span class="command"><strong>event</strong></span> "scorechar", "insname", kdelay, kdur, [, kp4] [, kp5] [, ...]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp19368704"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em><span class="quote">“<span class="quote">scorechar</span>”</span></em></span> -- A string (in double-quotes) representing the first p-field in a score statement. This is usually <a class="link" href="e.html" title="e Statement"><em class="citetitle"><span class="quote">“<span class="quote">e</span>”</span></em></a>, <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle"><span class="quote">“<span class="quote">f</span>”</span></em></a>, or <a class="link" href="i.html" title="i Statement (Instrument or Note Statement)"><em class="citetitle"><span class="quote">“<span class="quote">i</span>”</span></em></a>.
</p>
<p>
<span class="emphasis"><em><span class="quote">“<span class="quote">insname</span>”</span></em></span> -- A string (in double-quotes) representing a named instrument.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp19371856"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kinsnum</em></span> -- The instrument to use for the event. This corresponds to the first p-field, p1, in a score statement.
</p>
<p>
<span class="emphasis"><em>kdelay</em></span> -- When (in seconds) the event will occur from the current performance time. This corresponds to the second p-field, p2, in a score statement.
</p>
<p>
<span class="emphasis"><em>kdur</em></span> -- How long (in seconds) the event will happen. This corresponds to the third p-field, p3, in a score statement.
</p>
<p>
<span class="emphasis"><em>kp4, kp5, ...</em></span> (optional) -- Parameters representing additional p-field in a score statement. It starts with the fourth p-field, p4.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
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<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p> Note that the <span class="emphasis"><em>event</em></span> opcode cannot accept string p-fields. If you need to pass strings when instantiating an instrument, use the <a class="link" href="scoreline.html" title="scoreline"><em class="citetitle">scoreline</em></a> or <a class="link" href="scoreline_i.html" title="scoreline_i"><em class="citetitle">scoreline_i</em></a> opcode.</p>
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</div>
<div class="refsect1" title="Examples">
<a id="idp19429472"></a>
<h2>Examples</h2>
<p>
Here is an example of the event opcode. It uses the file <a class="ulink" href="examples/event.csd" target="_top"><em class="citetitle">event.csd</em></a>.
</p>
<div class="example">
<a id="idp19430368"></a>
<p class="title">
<strong>Example 209. Example of the event 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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o event.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1 - an oscillator with a high note.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Create a trigger and set its initial value to 1.</span>
ktrigger <span class="opc">init</span> 1
<span class="comment">; If the trigger is equal to 0, continue playing.</span>
<span class="comment">; If not, schedule another event.</span>
<span class="octrl">if</span> (ktrigger <span class="op">==</span> 0) <span class="octrl">goto</span> <span class="olabel">contin</span>
<span class="comment">; kscoreop="i", an i-statement.</span>
<span class="comment">; kinsnum=2, play Instrument #2.</span>
<span class="comment">; kwhen=1, start at 1 second.</span>
<span class="comment">; kdur=0.5, play for a half-second.</span>
<span class="opc">event</span> "i", 2, 1, 0.5
<span class="comment">; Make sure the event isn't triggered again.</span>
ktrigger <span class="op">=</span> 0
<span class="olabel">contin</span><span class="op">:</span>
a1 <span class="opc">oscils</span> 10000, 440, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="comment">; Instrument #2 - an oscillator with a low note.</span>
<span class="oblock">instr</span> 2
a1 <span class="opc">oscils</span> 10000, 220, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Make sure the score plays for two seconds.</span>
<span class="stamnt">f</span> 0 2
<span class="comment">; Play Instrument #1 for a half-second.</span>
<span class="stamnt">i</span> 1 0 0.5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is an example of the event opcode using a named instrument. It uses the file <a class="ulink" href="examples/event_named.csd" target="_top"><em class="citetitle">event_named.csd</em></a>.
</p>
<div class="example">
<a id="idp19432792"></a>
<p class="title">
<strong>Example 210. Example of the event opcode using a named instrument.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o event_named.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1 - an oscillator with a high note.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Create a trigger and set its initial value to 1.</span>
ktrigger <span class="opc">init</span> 1
<span class="comment">; If the trigger is equal to 0, continue playing.</span>
<span class="comment">; If not, schedule another event.</span>
<span class="octrl">if</span> (ktrigger <span class="op">==</span> 0) <span class="octrl">goto</span> <span class="olabel">contin</span>
<span class="comment">; kscoreop="i", an i-statement.</span>
<span class="comment">; kinsnum="low_note", instrument named "low_note".</span>
<span class="comment">; kwhen=1, start at 1 second.</span>
<span class="comment">; kdur=0.5, play for a half-second.</span>
<span class="opc">event</span> "i", "low_note", 1, 0.5
<span class="comment">; Make sure the event isn't triggered again.</span>
ktrigger <span class="op">=</span> 0
<span class="olabel">contin</span><span class="op">:</span>
a1 <span class="opc">oscils</span> 10000, 440, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="comment">; Instrument "low_note" - an oscillator with a low note.</span>
<span class="oblock">instr</span> low_note
a1 <span class="opc">oscils</span> 10000, 220, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Make sure the score plays for two seconds.</span>
<span class="stamnt">f</span> 0 2
<span class="comment">; Play Instrument #1 for a half-second.</span>
<span class="stamnt">i</span> 1 0 0.5
<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="idp19433744"></a>
<h2>See also</h2>
<p><a class="link" href="event_i.html" title="event_i"><em class="citetitle">event_i</em></a>,
<a class="link" href="schedule.html" title="schedule"><em class="citetitle">schedule</em></a>,
<a class="link" href="schedwhen.html" title="schedwhen"><em class="citetitle">schedwhen</em></a>,
<a class="link" href="schedkwhen.html" title="schedkwhen"><em class="citetitle">schedkwhen</em></a>,
<a class="link" href="schedkwhennamed.html" title="schedkwhennamed"><em class="citetitle">schedkwhennamed</em></a>,
<a class="link" href="scoreline.html" title="scoreline"><em class="citetitle">scoreline</em></a>,
<a class="link" href="scoreline_i.html" title="scoreline_i"><em class="citetitle">scoreline_i</em></a></p>
</div>
<div class="refsect1" title="Credits">
<a id="idp19436824"></a>
<h2>Credits</h2>
<p>Examples written by Kevin Conder.</p>
<p>New in version 4.17</p>
<p>Thanks goes to Matt Ingalls for helping to fix the example.</p>
<p>Thanks goes to Matt Ingalls for helping clarify the kwhen/kdelay parameter.</p>
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