What I was trying to do is find out if an INTRO can be recorded as a audio file to be used in the chord looper.
Mike, That’s not actually what you asked. You asked if you can record the intro chord progression, not the intro.
In any case, now we know what you want to do, way to do this is to record the chord progression in the looper. Then start the intro and move smoothly into the chord looper, while your granddaughter sings, you add whatever strings etc, ….and you are recording the whole thing as an audio.
But an even better way with less chance of error or putting off your granddaughter, is to prepare an accompaniment midi ahead of time. You would start the intro, then go into the song via the looper, while you quick record the whole accompaniment as a midi. Once you get it how you want as a midi, then you are ready to simply play it back while your granddaughter sings over it, recording the whole thing as an audio file. Much more secure, and stress free.
BTW, by preparing the accompaniment midi ahead of time, you may not even have to use the looper. Because you can add any number of additional tracks by multi tracking.
Mike