Never really got into accordion, but it was always interesting to listen to my friend Tony Lovello talk about the Three Sons and to here him play. Evidently he was an original member and toured and recorded with them right up to the end. The first arrangers I heard were the Auto Orchestra
(usually used by guitar players with bass pedals) and the Petosa accordion tony used. Both were products manufactured in Italy by
a company I understand to be a predicessor of Solton (Ketron).
Lovello is an interesting fellow, and evidently still active, as was mention earlier on this thread.
Russ