I wonder if we're talking about the same model. My unit is a Matias Tactile Pro 
3; it has 3 USB 2.0  ports, whereas the previous Tactile Pro has 2 ports. 

Vlad
 
On 16/09/2010, at 7:56 PM, Bill Parker wrote:

> 
> Vlad,
> 
> The keyboard has two USB "out" leads, they have only one minor difference and 
> that is the embossing one the usb plug.  I have function with either lead and 
> two are not nec. but the booklet says they must both be plugged into the 
> computer (MAc instructions).
> 
> 
> Bill
> 
> On 16/09/2010, at 7:08 PM, Vladimir James wrote:
> 
>> 
>> Only one lead to a USB2 socket is necessary for my Matias to work. I have no 
>> idea which 'second lead' you're referring to. Where in the instructions is 
>> this?
>> 
>> I have camera and trackball leads plugged into the Matias. Both work nicely, 
>> and I still have a spare port on the keyboard.
>> 
>> Not all the function keys work on the Matias as they do on the Apple 
>> keyboard. I use Keyboard Maestro to re-assign the function keys to suit my 
>> work.
>> 
>> Vlad James
>> wireless (NetComm 3G21WB)
>> 27" iMac 2.8 GHz i5 8GB
>> OS X 10.6.3
>> 
>> On 16/09/2010, at 5:57 PM, Bill Parker wrote:
>> 
>>> 
>>> Does anyone have experience with Matias keyboards?   I  have just purchased 
>>> one and it works - most of the time.  The instructions say both leads must 
>>> be plugged in.  Which lead is which the booklet does not say and often I 
>>> need one USB port for a modem.
>>> 
>>> There are times when I have mouse operational only.
>>> 
>>> Macbook pro/10.5.8.
>>> 
>>> 
>>> Bill
>>> Dr Bill Parker
>> 
>> 
>> 
>> 
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> 
> Dr Bill Parker
>  “The greatest enemy of the truth is not the lie – deliberate, contrived, and 
> dishonest – but the myth – persistent, pervasive, and unrealistic.”
> John F. Kennedy
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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