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Mon May 29 22:42:46 2017 UTC (3 years, 7 months ago) by schoenebeck
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* NKSP: Updated play_note() function.

1 <html>
2 <head>
3 <meta name="author" content="Christian Schoenebeck">
4 <title>play_note() function</title>
5 <meta name="description" content="Triggers a new note.">
6 </head>
7 <body>
8 <h1>play_note()</h1>
9 <p>
10 Triggers a new note to be played by the sampler. This is almost
11 like generating
12 a new MIDI note-on event programmatically, with the difference though
13 that triggering a note programmatically this way does not cause a
14 <code lang="nksp">note</code> event handler to be executed for the new note, nor
15 will any MIDI specific note-on handling be done (i.e. it will have
16 no effect on key switching or on the status of built-in array variable
17 <code>%KEY_DOWN[]</code>).
18 </p>
19
20 <h3>Function Prototype</h3>
21 <p/>
22 <code lang="nksp">
23 play_note(??note??, [??velocity??], [??offset-us??], [??duration-us??])
24 </code>
25
26 <h3>Arguments</h3>
27 <table>
28 <tr>
29 <th>Argument Name</th> <th>Data Type</th> <th>Description</th>
30 </tr>
31 <tr>
32 <td><code>??note??</code></td>
33 <td>Integer Number</td>
34 <td>Note number (absolute pitch).<br>
35 [required]</td>
36 </tr>
37 <tr>
38 <td><code>??velocity??</code></td>
39 <td>Integer Number</td>
40 <td>Trigger velocity.<br>
41 [optional, default: <code>127</code>]</td>
42 </tr>
43 <tr>
44 <td><code>??offset-us??</code></td>
45 <td>Integer Number</td>
46 <td>Start offset of the sample to be played in microseconds.<br>
47 <code>-1</code>: Do not override the start offset and use the
48 regular start offset as defined by the
49 instrument file.<br>
50 [optional, default: <code>-1</code>]</td>
51 </tr>
52 <tr>
53 <td><code>??duration-us??</code></td>
54 <td>Integer Number</td>
55 <td>Length of the note to be played in microseconds.<br>
56 <code>-1</code>: The note will be stopped when the event
57 handler's note stops (must only be used with
58 <code>note</code> event handlers).<br>
59 <code>0</code>: The entire note's sample will be played to its end.<br>
60 [optional, default: <code>0</code>]</td>
61 </tr>
62 </table>
63
64 <note>
65 You need at least LinuxSampler 2.0.0.svn2 or higher for passing a value
66 higher than <code>0</code> for <code>??duration-us??</code>.<br>
67 <br>
68 You need at least LinuxSampler 2.0.0.svn3 or higher for passing <code>-1</code> for
69 <code>??duration-us??</code>.<br>
70 <br>
71 You need at least LinuxSampler 2.0.0.svn55 or higher for passing any other value than <code>0</code> for
72 <code>??offset-us??</code>.
73 </note>
74
75 <h3>Return Value</h3>
76 <table>
77 <tr>
78 <th>Description</th> <th>Data Type</th>
79 </tr>
80 <tr>
81 <td>Note's event ID of the new note that has been triggered. This event ID can be
82 used to control the note during its life time.</td>
83 <td>Event ID Number</td>
84 </tr>
85 </table>
86
87 <h3>Examples</h3>
88 <p>
89 The following example resembles a simple delay effect. For each note
90 being triggered by the musician, the script launches additional notes,
91 each one of such additional successive notes with a more and more reduced
92 volume.</p>
93 <code>
94 on init
95 { The amount of notes to play }
96 declare const $delayNotes := 4
97 { Tempo with which the new notes will follow the orignal note }
98 declare const $bpm := 90
99 { Convert BPM to microseconds (duration between the notes) }
100 declare const $delayMicroSeconds := 60 * 1000000 / $bpm
101 { Just a working variable for being used with the while loop below }
102 declare polyphonic $i
103 { For each successive note we trigger, we will reduce the velocity a bit}
104 declare polyphonic $velocity
105 end on
106
107 on note
108 { First initialize the variable $i with 4 each time we enter this event
109 handler, because each time we executed this handler, the variable will be 0 }
110 $i := $delayNotes
111
112 { Loop which will be executed 4 times in a row }
113 while ($i)
114 { Calculate the velocity for the next note being triggered }
115 $velocity := 127 * $i / ($delayNotes + 1)
116 { Suspend this script for a short moment ... }
117 wait($delayMicroSeconds)
118 { ... and after that short break, trigger a new note. }
119 play_note($EVENT_NOTE, $velocity)
120 { Decrement loop counter $i by one }
121 $i := $i - 1
122 end while
123 end on
124 </code>
125
126 <h3>See also</h3>
127 <p><code>note_off()</code>, <code>set_controller()</code><p>
128
129 <h3>Availability</h3>
130 <p>Since LinuxSampler 2.0.0<p>
131
132 <note>
133 The special value <code>-1</code> for <code>??offset-us??</code> only exists
134 with NKSP, it is not available with KSP.<br>
135 <br>
136 Dynamic, optional arguments are
137 only supported by NKSP. If you want to retain compatibility to KSP,
138 then you should always pass a value for all arguments of this function.
139 </note>
140
141 </body>
142 </html>

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