piping the return function with variables

I would like to combine the 2 below return's into one line using the | symbol as mentioned in the TouchControl Instructions, but cannot get it too work.

Each return updates the text on a button named "AudioType" & "AudioRate" respectively. The text should be updated to the string contained in the variables "audioTypeName" & "audioRateName". I can get them both to work individually, but not together.

return 'AudioType^' + audioTypeName;

return 'AudioRate^' + audioRateName;

I have tried:

return 'AudioType^' + audioTypeName | return 'AudioRate^' + audioRateName;