Webconfig with existing rules

Hi, I am new to wordpress and find it incredible. The only problem I am having is combining the webconfig rules with ones I already have as I am parallel running a previous database on the site where I have installed wordpress.

The global rule with wordpress works fine but I need to create url friendly urls for my existing urls. The example below is one that used to work but doesnt with the wordpress global rule.

<rule name="Main Rule" stopProcessing="true">
            <match url=".*" />
            <conditions logicalGrouping="MatchAll">
                <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
            </conditions>
            <action type="Rewrite" url="index.php" />
        </rule>

    <rule name="RewriteUserFriendlyURL14" stopProcessing="true">
                    <match url="^visual/([^/]+)/([^/]+)/([^/]+)/?$" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="visual.asp?Keyword={R:1}&Mode={R:2}&Page={R:3}" />
                </rule>

I am using the permalinks to create urls with the post names. Does anyone know how to combine these rule types?
Thanks in advance
Richard