Hi, Andybear.
Thanks for reaching out to the community. 🙂
Really sorry to hear you're having issues with the audio on your TiVo® box. We'd like to get this sorted.
Can you try changing the audio settings from Dolby Digital to PCM?
Please press Home on your remote, select Help & Settings, select Settings, select Audio to change it.
Let us know if this works.
Kind Regards,
Chai_s