Hallo Mike,
Thanks for your suggestion. Unfortunately my PSR-500 is quite old and therefore has no usb midi to host port or cable, so that is not an option here. I use Cubase as my DAW, and this works fine using the midi in and out cable connected to my Alesis io2 Express midi interface, both with the PSR-500 and my Clavinova CLP-611. Its a bit annoying as it is preventing me add piano melody lines to the backings. Incidentally, my present set up works fine using a microphone through the Alesis to add vocals or acoustic guitar. Surely there must be a setting somewhere in Biab that I haven't found yet which would solve the problem?
David Bringloe (Hertfordshire)