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using external hardware. Audio Interfaces
Old 26th February 2011
using external hardware.


I have a saffire pro 40 interface that I got to essentially utilise my outboard harware with (EQ and COMP).

Up until now for the last year I have been using an apogee duet.

I am using Logic 9.(everything up to date including OSX)

To test things out I tried a little test.

I have an acoustic guitar part recorded.

I inserted Logics I/O plug in.

I have a balanced cable running from the saffire pro 40's number 4 output to its number 2 input.

I ping'd the I/O plug in in Logic and got 25 samples...all good.

Now the acoustic guitar is routed out of logic and back into the same channel.

I made a copy of the acoustic guitar track, and then put it out of phase (this of course doesnt have the I/O plug).

In theory, you should get a perfect null.

Of course reality, is you will hear the AD converter and any level differences.

My system runs at 0VU = -20dBfs.

The closest I can come to nulling, is around -40db with my guitar signal going out and back into logic at my 0VU point.

I was expecting to be much closer than that.

I have been mucking about with this for an hour or so.

How far down, would you expect the null to be, I would have thought really really least 80db down.

I can of course remove the I/O plug in from the first track and then I get a perfect null.

So, to summarise, the lowest I can get the null to be, running the saffire pro's output to an input, is around 40dB down.

any thoughts.


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