Hi rotty:

I have the PR804 which uses the same file types as the PR604. The PR604 will load and play TRUE KN6000, KN6500, and KN7000 most file types. As well as the PR702/902 and PR703/903 file types.

It won't load/play KN5000, KN3000, KN2000 and downwards, and won't load PR600/700/900. However, it will load/play the composer only on PR600/700/900 file types.

There is a KN7000 website that does have a free (that's right) a free great library of rhythms from the KN2000, KN3000, KN5000 and KN6500 models in KN7000 format which will work on the PR604. I checked that site out and it's offline for changes.

May I ask what KN model files did you get from Ebay?

Anthony