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<H2>
ion, ioff, iondur, iondur2</H2>
<PRE> <B>ion</B> ichn, inum, ivel
<B>ioff</B> ichn, inum, ivel
<B>iondur</B> ichn, inum, ivel, idur
<B>iondur2</B> ichn, inum, ivel, idur</PRE>
<HR>
<H4>
<U>DESCRIPTION</U></H4>
send note-on and note-off messages to the MIDI OUT port.
<H4>
<U>INITIALIZATION</U></H4>
<I>ichn</I> - MIDI channel number (0-15)
<P><I>inum</I> - note number (0-127)
<P><I>ivel</I> - velocity (0-127)
<H4>
<U>PERFORMANCE</U></H4>
<B>ion</B> (i-rate note on) and <B>ioff</B> (i-rate note off) are the simplest
MIDI OUT opcodes. <B>ion</B> sends a MIDI noteon message to MIDI OUT port,
and <B>ioff</B> sends a noteoff message. A <B>ion</B> opcode must always
be follwed by an <B>ioff</B> with the same channel and number inside the
same instrument, otherwise the note will play endlessly. These <B>ion</B>
and <B>ioff</B> are useful only when introducing a timout statement to
play a non zero duration MIDI note. For most purposes it is better to use
<B>iondur</B> and iondur2.
<P><B>iondur</B> and <B>iondur2</B> (i-rate note on with duration) send
a noteon and a noteoff MIDI message both with the same channel, number
and velocity. Noteoff message is sent after <I>idur</I> seconds are elapsed
by the time <B>iondur</B> was actived.
<P><B>iondur</B> differs from <B>iondur2</B> in that <B>iondur</B> truncates
note duration when current instrument is deactivated by score or by realtime
playing, while <B>iondur2</B> will extend performance time of current instrument
until <I>idur</I> seconds have elapsed. In realtime playing it is suggested
to use <B>iondur</B> also for undefined durations, giving a large <I>idur</I>
value.
<P>Any number of <B>iondur</B> or <B>iondur2</B> opcodes can appear in
the same Csound instrument, allowing chords to be played by a single instr.
<H4>
<U>AUTHOR:</U></H4>
Gabriel Maldonado
<BR>Italy
<BR>May 1997
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