Codes for TiVo Remote

My wife likes to use the TiVo remote when watching TV. I tried to map the 950 volume and mute functions to the TiVo remote, but TiVo Doesn't list Outlaw as a supported manufacturer. Are there any other manufacturers codes that will work?

As far as I know, you would have to use a programmable remote. Sorry. Maybe someone else will have a suggestion.

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Stott