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-rw-r--r--doc/filters.texi8
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diff --git a/doc/filters.texi b/doc/filters.texi
index 706debcbce..1eb2027d02 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6436,15 +6436,23 @@ Set LFE output volume. By default, this is @var{1}.
@item allx
Set spread usage of stereo image across X axis for all channels.
+Allowed range is from @var{-1} to @var{15}.
+By default this value is negative @var{-1}, and thus unused.
@item ally
Set spread usage of stereo image across Y axis for all channels.
+Allowed range is from @var{-1} to @var{15}.
+By default this value is negative @var{-1}, and thus unused.
@item fcx, flx, frx, blx, brx, slx, srx, bcx
Set spread usage of stereo image across X axis for each channel.
+Allowed range is from @var{0.06} to @var{15}.
+By default this value is @var{0.5}.
@item fcy, fly, fry, bly, bry, sly, sry, bcy
Set spread usage of stereo image across Y axis for each channel.
+Allowed range is from @var{0.06} to @var{15}.
+By default this value is @var{0.5}.
@item win_size
Set window size. Allowed range is from @var{1024} to @var{65536}. Default size is @var{4096}.