Hello can anyone tell me what sound files are compatable with the Korg PA50sd I have downloaded some PCG files which seem ok. But would like to know what ones are compatable from other Korg Keyboards ?

Hello:

The only Series that is fully compatible with the PA 50SD are:

Series PA 80/60/50/50SD and the MicroArranger, I did not include the PA1X/PA1X Pro because on these larger models had sampler and other functions that the PA 50/50SD do not have and may not work.
I hope this helps.

Manuel