We invested in the full set of accompaniments - over 1000 in all - and they have been invaluable for our soloists so far, as we can quickly learn new hymns tunes and accompaniments.
So far we have been very lucky in that every funeral we have performed at has booked an organist, and to be honest, we'd always rather sing with a real live organist than recordings, given the choice.
However, our funeral hymns backing tracks, for lack of a better phrase, will soon come into their own when we will be singing at a funeral in a tiny country church where there is no organ at all. Our library also includes our own recordings of songs and opera arias, so whatever the family chose from their funeral service music, we should be covered!