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-rw-r--r--UPGRADE.txt10
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diff --git a/UPGRADE.txt b/UPGRADE.txt
index 46bf90d06..319a9fc6e 100644
--- a/UPGRADE.txt
+++ b/UPGRADE.txt
@@ -449,3 +449,13 @@ API:
have a module that uses the services provided by res_adsi, res_odbc, or
res_agi, you will need to add ast_ prefixes to the functions that you call
from those modules.
+
+Formats:
+
+* format_wav: The GAIN preprocessor definition has been changed from 2 to 0
+ in Asterisk 1.4. This change was made in response to user complaints of
+ choppiness or the clipping of loud signal peaks. The GAIN preprocessor
+ definition will be retained in Asterisk 1.4, but will be removed in a
+ future release. The use of GAIN for the increasing of voicemail messages
+ should use the 'volgain' option in voicemail.conf
+