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. and see what happens.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. Now test again exactly as described earlier and do not reconnect any controllers yet. If you have upgraded from an earlier version of Logic Pro, you should also remove ~/Library/Preferences/Logic/.If you are having trouble with a control surface in Logic Pro X, then you may also wish to delete the .cs file from the preferences folder. See the Logic Pro X User Manual for details on how to do this. You may wish to export your custom key command as a preset before performing this step. Note that if you have programmed any custom key commands, this will reset them to the defaults. Remove the file from the Preferences folder.Type ~/Library/Preferences in the 'Go to the folder' field.In the Finder, choose Go to Folder from the Go menu.

To reset your Logic Pro X user preference settings to their original state, do the following: You can resolve many issues by restoring Logic Pro X back to its original settings. If you continue to have an issue then delete the Logic prefs and the CS prefs as described below. If not then you have narrowed down the cause to something external or something being caused by a setting in an existing project created earlier. Record a couple of Instrument tracks using the Musical Typing Keyboard (Logic's menu bar/Window/Show Musical Typing ) and see if you get any of the issues you are reporting.

Unplug all midi controllers plus turn off (not just put to sleep) your iPad/iPhone if you have one (In case something is running on those in the background causing an issue) Well, I can say such behavour is not normal and probably isn't directly related to Logic itself but more towards your controller(s) so.

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