Usb driver for mac os x

Newer Casio models that have "class compliant" USB interfaces such as the PX-330 would work (plug and play) since they now have "class compliant" drivers.
Unfortunately PX-300 is an older model that would need specific drivers and Casio only made drivers for Windows PCs.

Casio don't supply PX330 drivers for IPAD.
Get a Windows 8.1 tablet or connect PX330 to a desktop PC and use IPAD to Remote control that PC.

PX 410r uses IDES 4.0 downloadable from
http://www.casio-europe.com/euro/emi/specials/ides/downloads/
and not another version.

I suggest you uninstall the Casio USB driver from Control Panel'system'device manager then Reboot the PC without the USB cable.
Download latest USB driver from :-
http://support.casio.com/en/support/download.php?cid=008&pid=20
64 or 32 bits versions are both available.
Load driver first. Plug in the usb cable only when software tells you to do so.
Uninstall Data manager if wrong version.
Install IDES 4.0

Make sure you follow the steps of the procedure below exactly. Connecting incorrectly can make data
send and receive impossible.
1.
Turn off the digital piano and then start up
your computer.
• Do not start up the music software on your computer
yet

3.
Turn on the digital piano.
• If this is the first time yo
u are connecting the digital
piano to your computer, the driver software required
to send and receive data will be installed on your
computer automatically.
4.
Start up your computer's music software.
5.
Configure the music software settings to
select one of the following as the MIDI device.
CASIO USB-MIDI

Check the midi channel. It needs to sync to FL Studio. Channel settings you'll need to look up in the privia manual...can be laborious - but worth it in the end :)

Make sure your MAC and the piano are plugged into the SAME receptacle to avoid ground bounce noise.

I SUSPECT that the USB connection is ECHOING the data, causing multiple generators to be active. Those extra ones then are mixed into the line out of the keyboard. In your PC, make sure the echo setting is turned off, OR disable the sending out of audio via the USB. Alternatively, DISABLE MIDI/USB incoming to the keyboard.

use the audio output to send the keyboards internal patch sounds, or use a usb midi adapter to use the keyboard to trigger the garageband midi sounds, if the keyboard has a midi output, that is. the usb output requires software drivers to use, and IS NOT mac compatible. You may have to select a midi source in garage band preferences or settings if you are using midi.

WHich driver do you download for the midi? please, I dont have any idea. can you share a link where I can install or download the driver?

Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.