Now got 2GB in the audio PC, St Augustines loads fine, Stiehr Mockers fails, both original and Ext, si I erased and re-downloaded, now works.
I found editing the organ files in notepad somewhat traumatic there seem to be so many interdependant things, must admit I chickened out after a couple of hours hair pulling.
Second keyboard arrived today, pure midi, no internal sound, drives the Farfisa or the PC, but the Farfisa does not appear to have a midi thru function so back to ebay for a midisport or similar, 2 or more midi inputs to the box and single USB out, either that or a second midi/usb cable, but not sure if the PC will support 2 USB Audio devices. Anybody tried?