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Re: Same Devices to one Mac
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Re: Same Devices to one Mac


  • Subject: Re: Same Devices to one Mac
  • From: "Hiroshi T." <email@hidden>
  • Date: Tue, 19 Dec 2006 21:54:40 +0900

Thanks for your reply.
Fortunately, the device is made up with Burr Brown chip and it uses built-in OS X driver.
I'll get it and try.


On Dec 19, 2006, at 3:41 AM, Jeff Moore wrote:

It depends. If the device uses the built-in USB Audio Class driver, you should see both instances of the device show up on the system. The built-in USB Audio Class driver supports multiple instances of the same device just fine.

If the device uses a custom driver, then all bets are off. I would hope that you would always see the first one you plugged in, but it really depends on how the driver works. I imagine that if you booted a machine with both plugged in, the one the system would see might be random.

FWIW, there's nothing in the system that would keep a developer from making a driver that supports accessing both devices simultaneously when plugged in.

On Dec 17, 2006, at 8:51 PM, Hiroshi T. wrote:

I want to use two identical Core Audio-compatible USB audio devices for recording simultaneously in OS X 10.3.9.
The maker of the device says they do not support multiple devices at the same time.


What will actually happen if I connect two identical USB audio devices to one Mac?
Will OS X name them differently?


--

Jeff Moore
Core Audio
Apple


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References: 
 >Same Devices to one Mac (From: "Hiroshi T." <email@hidden>)
 >Re: Same Devices to one Mac (From: Jeff Moore <email@hidden>)

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