Hi Peter,
The accompaniment is the Genos played from the lower manual of the AR along with the AR organ draw bars. The upper manual of the AR is the AR organ draw bars. The bass is the Genos played on the pedals. I could play the Genos voices from the upper manual of the AR but have disabled this at the moment.
Loved the ELO tune, how about Mr Blue Sky next?
Regards,
Simon