We have found one software suitable in our database for this conversion.
Camtasia offers export of its own projects (.camproj) to MPEG-4 (.mp4) format by default, so you just have to use the existing share and publish function to generate one. The resulting file contains both video and audio, so if you need only audio (.m4a) you will have to further convert mp4 to m4a.
This is likely the only way to achieve camproj to m4a conversion and there is no alternative, simply because Camtasia projects are only useable in Camtasia.
CAMPROJ
Files with camproj extension are projects created and saved in Camtasia Studio video capture software.
M4A
Files with m4a extension are audio files stored in MPEG-4 (MP4) container and use AAC (Advanced Audio Coding), or Apple Lossless (ALAC) audio compression. M4A is very popular on Mac computers, because it is default audio format used by iTunes. M4A is also default audio format for Apple portable devices (iPod, iPhone, iPad).