It is hooked up wrong. Where did you get this TBS from?

The TBS has two "Prop 1" locations. Think of them and in and out, Your throttle channel for your radio goes into one of the Prop ones. The other prop one goes out to your Clark throttle channel. This effectively puts the TBS between the receiver and the Clark unit.

You also have to make sure the parameter file is programmed right, and of course you have to make sure the proper sound file is loaded on the TBS.

Just to make it simple I would have the parameter file set to auto start. A quick blip on the throttle channel will start up the TBS sound, Once you get it working then you can look at changing the parameter file to manual start and assigning the start feature to a radio function,

Email me if you need help. When I sell these to people I ask the question what they are going to be using it with. When they say a Clark I do all the programming for them, and it is just plug and play. I take it that you did not buy this from me? I say this because I usually don't let one go out the door unless I know what the intent of use is.. You will need a programing cable as well if you don't have one.

Cheers

Dan