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I have a Casio PX150 connected to my Mac using the USB cable. It is communicating and using Garageband for sounds but the volume is significantly low even at the computer's maximum volume setting. It also requires impractical key force to generate volume. It produces a strong as should be expected signal according to the DAW meters but the actual audio I hear through headphones is weak. The same is true when hooked up to Kontakt and 3rd party sample software. I see a good signal tripping the meters but this is not reflected in the signal through my headphones. The headphones are fine. I use them everyday. Regardless, I have tried two different pairs while testing the setup using a Mac Pro, Mac Mini and Macbook Pro. Each computer has a different OS version but they all meet the minimum requirements. It has not displayed this problem in the past. I was able to use the piano without this problem. It has been over a year since I used the piano. The keyboard has sat in the same place. It was under a dust cover. I just did not have time to play it. I doubt it is related to failure in the hardware. I had disconnected the USB cable because during the time I was not playing I had acquired the Mac Pro and shifted my desktop area to accommodate two systems and three ACD's. There must be something in the settings I am doing wrong. I have only set up the connection a few times. But I was able to do it without a problem each time. Usually the keyboard was connected and I just turned it on and opened software. I tried different sequences turning each on first. Reconnecting the keyboard I could have forgotten a setting or something. I read the user guide and it is a very simple process. There is nothing like this in the trouble shooting section. Sharing any ideas would be greatly appreciated.