clarify

doc/fluidsettings.xml

@@ -348,7 +348,7 @@ Developers:
             <max>100.0</max>
             <realtime/>
             <desc>
-                Sets the stereo spread of the reverb signal. A value of 0 indicates no stereo-separation causing the reverb to sound like a monophonic signal. A value of 100 indicates maximum separation between left and right channels. Otherwise, this setting should be considered as dimensionless quantity. Please note that under some circumstances, values bigger than 1 may induce a feedback into the signal which can be perceived as unpleasant.</desc>
+                Sets the stereo spread of the reverb signal. A value of 0 indicates no stereo-separation causing the reverb to sound like a monophonic signal. A value of 1 indicates maximum separation between the the left and right channels (i.e. reverb is still a monophonic effect). This subrange [0;1] is recommended for general usage. Values bigger 1 increase (or exaggerate) the perception of the uncorrelated left and right signals. Otherwise, this setting should be considered as dimensionless quantity, with its maximum value existing due to historical reasons. Please note that under some circumstances, values bigger than 1 may induce a feedback into the signal which can be perceived as unpleasant.</desc>
         </setting>
         <setting>
             <name>sample-rate</name>

src/rvoice/fluid_rev.c

@@ -66,7 +66,8 @@
  *  - width (0 to 100): controls the left/right output separation.
  *    When 0, there are no separation and the signal on left and right.
  *    output is the same. This sounds like a monophonic signal.
- *    When 100, the separation between left and right is maximum.
+ *    When 1, the separation between left and right is maximum.
+ *    When 100 the perception of this separation is further "exaggerated".
  *
  *  - level (0 to 1), controls the output level reverberation.
  *