I am used to Sony Vegas and in that program, I can just drag an audio file and it loops the audio for the duration I dragged it to. For some reason, I can only seem to trim the audio files but not extend them. Is that even an option?
I'm new to Camtasia and here's what I've found, it does not have any audio 3rd party plug in integration, but here's what you can do... export the audio, and then edit it in audio tool of your choice. To reintegrate it, you can delete the audio track and import it back in. Not fun but do-able.