I needed to detach the keyboard and return to the previous configeration and followed the instructions supplied with the instrument to un install the instrument and the driver.
Following this the PC would not recognise the previous speakers.When I go into device Manager the USB composite device is no longer shown.However in Sound and Games controllers C-Media AC97 device appears with a yellow exclamation mark beside it and appears to be disabled.Also under the "sound and games controllers" appear Panasonic USB midi and MPU-401 Compatible Device which my research indicate may both be linked to the Technics 7000 keyboard(Manufacturer Panasonic).
Could C-media AC97 device be the original speakers?
Ideally I would like to install a headset with microphone instead of the original speakers to take advantage of PC to Pc calls.
I really am quite a novice when it comes to this problem and would appreciate some help in step by step form,so does anyone know what I shoud do next as I don't want to go into it blind and possibly do damage.