thank you for your answers. dannac how is the sound quality using the method you have described ?
I s you've figured out that sound or audio data does not travel through the USB interface.
If you were to connect the piano's line-out to the computer's line-in the captured sound quality depends entirely on the quality of the computer's audio interface. So asking if some one else got good result does not help unless the two of you have the exact same computer. The quality of those interfaces varies a lot, from "pretty good" to quite poor. On low cost generic PC notebooks, don't expect much but the result will be listenable and maybe even good. You will need the correct cable, don't try using a stack of adaptors. Most music stores (Guitar Center,...) have what you need
For best quality you'd need an USB or Firewire connected external audio interface box. Good ones start at abut $100 with $150 being a typical price for a "name brand" unit from the likes of Presonus, Focusrite, MOTU, or one of the others. These boxes can give truly professional quality, limited only by the piano's sound
The other way to record that can produce very good result is to go back to the USB cable. What is sent over that is little bits of data the say when a note is played or if your foot is moving a pedal. This is sent using MIDI format over the USB. Then software on your computer generates the sound. This software can actually be much better than what Roland put in the HP302. The best audio quality is done this way.
The details of how to do this depend on what kind of computer you have the OS and so on. On an Apple Mac it's just plug and play as the software for this kind of work is pre-installed at the factory. If a Windows PC then you have some research and shopping to do
