The title says all. I was coding in my Sims3 game, and these are the only lines of code I added via copy-paste with a few differences. The lines in bold are the custom code I added via not copy-paste.

<Channel_Name>Anime</Channel_Name>
<Channel_Level>Level1</Channel_Level>
<Video_File_Names>AnimeChannelShow1</Video_File_Names>
<Effect_On_Skill>Writing</Effect_On_Skill>
<Sync_Event_Name></Sync_Event_Name>
<Buff_Prereq></Buff_Prereq>
<Target_Buff></Target_Buff>
<IsRomanticChannel>1</IsRomanticChannel>
<IsWorkOutChannel>0</IsWorkOutChannel>
<IsHorrorChannel>1</IsHorrorChannel>
<IsKidsChannel>1</IsKidsChannel>
<IsSportsChannel>0</IsSportsChannel>
<TeachesRecepies>0</TeachesRecepies>
<IsVideoGameChannel>1</IsVideoGameChannel>
<IsHomeMovieChannel>0</IsHomeMovieChannel>
<IsWeatherChannel>0</IsWeatherChannel>
</TVChannel><Associated_Traits>-</Associated_Traits>





The "0" is for false, like in the cheat "Testingcheatsenabled False"

Whilst "0" is for true, like in the cheat "Testingcheatsenabled True"





I don't know what the hell I did, but now my game is screwed up. And just after I got the audio in TS3 and 4 back...

This is a modding question. You should try create/Sims3/modding discussion in the menu above.

I am going to guess that this is XML tuning, and if it is i hope you didn't edit the file itself but first extracted the wanted tuning and than edited it.
Plus adding a channel would be more work than copy-paste already written code(probably needed new scripts, videos...).

What i'd recommend is to got to the file you edited and remove the code you added, that should fix what you did

Doesn't this mean it'll show up only when playing video games?
And, like MeltingMagnetz said, you need to link the videos to this channel, maybe add a new interaction-type option on the TV so this channel shows up alongside the others.

I did.....................................

There must be something else you missed. We need more information than just "I did." Frankly, I think this thread should be under modding discussion since you're apparently creating a new channel? Also, maybe the <IsVideoGameChannel> tag could be the culprit since it shouldn't be set alongside regular TV channel. Just my guess.