If you're trying to use the record button in the transport at the top of the window, you're looking in the wrong place -- that's for automation recording.
Try double-clicking on SoundOut and select a file to record there, and use the record button in the SoundOut.
You could also use a FileRecorder contraption -- but SoundOut is easiest if you just want to record the whole thing you're doing.
If you're trying to use the record button in the transport at the top of the window, you're looking in the wrong place -- that's for automation recording.
Try double-clicking on SoundOut and select a file to record there, and use the record button in the SoundOut.
You could also use a FileRecorder contraption -- but SoundOut is easiest if you just want to record the whole thing you're doing.