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-May 6, 2010 v0.0.2 by Tim.
-
-Understanding the Effects Rack
-------------------------------
-
-All audio track types (Input, Output, Group, Wave, Synth, and Aux) have
- an effects rack into which audio plugins can be inserted in a chain. 
-Currently each rack can accomodate up to four plugins.
-
-MusE currently supports LADSPA plugins and DSSI effects plugins.
-
-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.
- 
-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.
-
-For mono tracks with plugins having more than one audio input or output, 
- MusE uses the first input or output and ignores the rest. 
-
-For stereo tracks:
-    
-    Plugin    Plugin      Independent   Real number      Real number 
-    audio     audio       plugin        of track         of track
-    inputs:   outputs:    copies:       input route      output route 
-                                        channels used:   channels used:
-    -------------------------------------------------------------------
-       0          0          1              0                0
-       0          1          2              0                2
-       0       >= 2          1              0                2
-       1          0          2              2                0
-       1          1          2              2                2
-       1       >= 2          1              1 L only!        2
-    >= 2          0          1              2                0
-    >= 2          1          2              2                2
-    >= 2       >= 2          1              2                2
- 
-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).
- 
-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. 
- 
-Currently plugins with no audio outputs are not really useful in MusE,
- chiefly because plugin control outputs are not used or displayed.
-Nor are specialized plugins with many inputs and/or outputs.
-
-Nor are so-called 'realtime' control plugins which use audio inputs 
- and outputs for control signals. 
-<<< 
- Loud noise alert! Beware of using such plugins in an audio effects rack. 
->>>
-
-
-Example: Consider a stereo Audio Input track with these effect rack 
- LADSPA plugins: 
- 
-    comb_splitter      Comb Splitter      by Steve Harris, and
-    tap_stereo_echo    Tap Stereo Echo    by Tom Szilagyi
-
-The Comb Splitter has one audio input and two audio outputs. 
-The Stereo Echo has two audio inputs and two audio outputs.
-  
-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.      
-  
-  
-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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