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authorTim E. Real <termtech@rogers.com>2013-02-22 06:51:28 +0000
committerTim E. Real <termtech@rogers.com>2013-02-22 06:51:28 +0000
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+
+<H1><A NAME="SECTION00410000000000000000">
+Understanding the effects rack</A>
+</H1>
+One must carefully consider how many audio inputs and outputs a plugin
+has, and how may channels the particular audio track has (1 mono or
+2 stereo), and how MusE uses the plugins in the rack.
+
+<P>
+MusE will try to internally create as many independent copies
+(instances) of a plugin as necessary, to satisfy the number of channels
+in the audio track.
+Basically it divides the number of track channels by the number of
+plugin audio inputs or outputs to determine how many copies to make.
+First it examines the number of plugin audio outputs, and if there are
+none, it will examine the number of audio inputs, and if there are
+none, it will simply use just one plugin copy.
+
+<P>
+For mono tracks with plugins having more than one audio input or
+output, MusE uses the first input or output and ignores the rest.
+
+<P>
+For stereo tracks:
+
+<P>
+<TABLE CELLPADDING=3 BORDER="1">
+<TR><TD ALIGN="CENTER">plugin inputs</TD>
+<TD ALIGN="CENTER">outputs</TD>
+<TD ALIGN="CENTER">copies</TD>
+<TD ALIGN="CENTER">track in route channels</TD>
+<TD ALIGN="CENTER">track out route channels</TD>
+</TR>
+<TR><TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">0</TD>
+</TR>
+<TR><TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+<TR><TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+<TR><TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">0</TD>
+</TR>
+<TR><TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+<TR><TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">1 (L only)</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+<TR><TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">0</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">0</TD>
+</TR>
+<TR><TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+<TR><TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">&gt;=2</TD>
+<TD ALIGN="CENTER">1</TD>
+<TD ALIGN="CENTER">2</TD>
+<TD ALIGN="CENTER">2</TD>
+</TR>
+</TABLE>
+
+<P>
+Notice that on a stereo track with a plugin having one audio input and
+two audio outputs, only the first track input route channel is used
+(left only).
+
+<P>
+These same rules apply to inter-plugin audio when more than one plugin
+is in the rack chain. Extra audio outputs of one plugin may be ignored
+by the next plugin if not used.
+
+<P>
+Currently specialized plugins with many inputs and/or outputs are not
+really useful in MusE.
+
+<P>
+Nor are so-called 'realtime' control plugins which use audio inputs
+and outputs for control signals.
+
+<P>
+Loud noise alert! Beware of using such plugins in an audio effects
+rack.
+
+<P>
+Example: Consider a stereo Audio Input track with these effect rack
+ LADSPA plugins:
+
+<P>
+
+<UL>
+<LI>comb_splitter Comb Splitter by Steve Harris
+</LI>
+<LI>tap_stereo_echo Tap Stereo Echo by Tom Szilagyi
+</LI>
+</UL>
+
+<P>
+The Comb Splitter has one audio input and two audio outputs.
+The Stereo Echo has two audio inputs and two audio outputs.
+
+<P>
+The stereo Audio Input track will therefore ignore its second
+input route connection. It will process the left input only,
+separating it into stereo with the Comb Splitter, passing the
+split stereo signal into the Stereo Echo, finally producing
+stereo output available at the Audio Input track's output routes.
+
+<P>
+One improvement would be not creating unused redundant plugin copies
+between plugins in stereo tracks.
+For example, for a plugin having one audio input and one audio output,
+feeding a plugin having one audio input and two audio outputs,
+the extra copy of the first plugin is redundant and not required,
+but currently it is created anyway.
+
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