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You can connect any class compliant USB audio interface or MIDI controller or keyboard to your iPad. This article shows you what devices you can connect, and also includes some tips to ensure success when using the Apple Camera iPad Connection Kit.
All class compliant USB audio interfaces, MIDI controllers and keyboards can be connected to the iPad using the Apple iPad Camera Connection Kit.
A class compliant device is one that doesn't require extra drivers to connect your Windows or Macintosh computer, or to your iPad. Class compliant devices use drivers which are built into the host (i.e. the computer or the iPad) operating system.
To find out if your USB audio or MIDI device is class compliant, check the manufacturer's web page. If it connects automatically to any computer without requiring you to install drivers from a website or a disk, it is probably class compliant.
Many USB devices draw their power right from the USB cable that connects them to their host (a computer or an iPad). The iPad can also supply power to connected USB devices. The USB ports on computers supply 5V and 100mA-500mA of power. However, through the course of several updates and revisions, Apple has decreased the amount of electrical power the iPad is allowed to supply connected USB devices.
This means that some devices that draw only a little power can survive off of what the iPad supplies, but devices that require more power may not find the iPad USB connection sufficient. Furthermore, Apple can and has altered how much juice the iPad can offer connected devices, so what may have worked in the past, may not necessarily work in the future.
You have a MIDI or Audio device, a USB cable, the Apple Camera Connection Kit adapter, and your iPad...
Even if the device you are connecting requires very little power, if you connect them in the wrong order, you're likely to get the following error: Accessory Unavailable. The attached accessory uses too much power.
To maximize the likelihood of a successful connection with an audio or MIDI device, you need to...
If you still get the error above, or if the class compliant device does not function within 10 seconds of connection, the device likely requires more power than the iPad can supply.
If the device you are connecting requires more power than the iPad can supply, connect it to an AC powered USB hub. Powered USB hubs have AC power adapters that connect them to an electrical socket on the wall. This will help ensure any connected devices have enough power to operate.
Note that Apple can and has altered how much juice the iPad can offer connected devices, so what may have worked without a powered hub in the past, may not necessarily work in the future.
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