
I unplugged the USB cable from my computer. I installed the latest version of the driver- but I didn't follow the installation instructions exactly in particular, I did not turn off my computer first as requested in the instructions. Okay, the computer wouldn't see the PSR-EW400 as an audio device without the driver installed. Likewise, if the situation were reversed and you were trying to install the Steinberg driver with a Yamaha keyboard that has USB-MIDI but not USB-audio, I think you would also get an error, because the Steinberg driver is programmed to expect both types of data in the USB signal and would not be able to handle the lack of audio data in the USB signal. So you need the Steinberg driver, which is programmed to handle both types of data.

I don't think the Yamaha driver can understand the combined audio and MIDI data- it isn't programmed to pick out the MIDI data and ignore the audio data- which is why it can't detect the keyboard as you're expecting. The PSR-E363's USB connection carries audio and MIDI data simultaneously, and the driver needs to be able to understand the data coming through the USB connection. I think the Steinberg driver is for both USB-audio and USB-MIDI, while the Yamaha driver is for USB-MIDI only.

I look forward to learning keyboard playing with this thing and as a final surprise it turned out Guitar Center has a sale on it until the end of the month reducing the price by around $30 I believe.I think that with the PSR-E453/PSR-EW400 as well as the PSR-E363/PSR-EW300/YPT-360 you're supposed to install the Steinberg USB driver, and only that driver, not the Yamaha USB driver. One very nice feature is the playback controls for moving around the application timeline and just hitting the record button to start laying down the track. Everything can easily be assigned or ‘learned’ on Logic and you are up and running in no time. There is also midi assignable sliders and pots, truly everything you’ll ever need in a midi controller (for many anyway I suspect).

I have to say after using it I am blown away by it, the keys feel good and are touch sensitive, the 8 pads on the top right are essentially tap pads and are great for tapping out a drum loop or triggering sound effects. This keyboard suited those requirements and more. My first requirement was it had to be USB powered because I really didn’t need another power pack hanging from the wall, the 2nd was that it had to work correctly under OS-X 10.5.2 and the last being it had to work easily without hours of configuration in Logic Express 8. Well I needed to replace my Midi keyboard and after some research and basic requirements I settled on M-Audio’s Axiom 49. As you may of noticed by now I am a big music fan and just for fun Guitar player.
