Aranosis are the original inhabitants of the Vall d'Aran, which is, at least in mediaeval terms, a very, very long way away from Andorra and even today a journey of about three hours by car. As for the Basque country that's even further away and no one knows from where the Basques got their language (there are various theories, but none that stand up to close scrutiny).
As for the Andosins, who knows what they spoke? The Andosins were 9th century inhabitants around these parts and the first treatise in recognisable "modern" Catalan, was in the 14th century in the HomÃlies d'Organyà written by the local priest(Organyà is close to Andorra)and five centuries can make a lot of difference. I don't think that anyone can tell you for certain.