--- a/webaudio/specification.html	Mon Feb 25 15:48:12 2013 -0800
+++ b/webaudio/specification.html	Mon Feb 25 15:52:15 2013 -0800
@@ -4105,10 +4105,11 @@
 
 
 <ol>
-<li><dfn>channelCount</dfn> is used to help compute <dfn>computedNumberOfChannels</dfn>.</li>
+<li><dfn>channelCount</dfn> is used to help compute <dfn>computedNumberOfChannels</dfn>.  Its default value is 2.</li>
 
 <li><dfn>channelCountMode</dfn> determines how <dfn>computedNumberOfChannels</dfn> will be computed.
-Once this number is computed, all of the connections will be up or down-mixed to that many channels.
+Once this number is computed, all of the connections will be up or down-mixed to that many channels.  For most nodes,
+the default value is "max".
 <ul>
 <li>“max”: <dfn>computedNumberOfChannels</dfn> is computed as the maximum of the number of channels of all connections.
 In this mode <dfn>channelCount</dfn> is ignored.</li>
@@ -4121,7 +4122,7 @@
 <li><dfn>channelInterpretation</dfn> determines how the individual channels will be treated.
 For example, will they be treated as speakers having a specific layout, or will they
 be treated as simple discrete channels?  This value influences exactly how the up and down mixing is
-performed.
+performed.  The default value is "speakers".
 
 <ul>
 <li>“speakers”: use <a href="#UpMix-sub">up-down-mix equations for mono/stereo/quad/5.1</a>.