Hi pedro,
I have an old Digitech RP6 and I connect it to my M-Audio 24/96 analog inputs directly. But my advice is just to use the compressor or overdrive effects from an FX processor. I prefer using any amp modeling or time-based effects like chorus, delay and reverb as LADSPA plugins because when it's mixing time, it's more flexible. No intruded effect cannot be removed later (except eq) and if you want to change the timings of delays, choruses and reverbs later (on the mixing session), plugins are more comfortable.
Any sound card that have an instrument direct input, gives better results. And another advice from me is to record the guitar tracks in mono (maybe by only using the pedal's Left-mono output because most of the pedals are psuedo stereo (which is done by chorusing or flanging). The real stereo is more preffered when done in mixing by panning, doubling the tracks etc.
Best regards.

On Mon, May 12, 2008 at 6:20 PM, Cesare Marilungo <cesare@poeticstudios.com> wrote:
Pedro Ferreira wrote:
> Hello,
> I want  to record some stuff from a BOSS GT8 pedalboard, and I was
> wondering what is the best audio interface to do it.
> I thought about the M-Audio MobilePre USB, but it seems the inputs are
> high impedance, so, i guess it's not advisable for processed signal.
> So, I found the Edirol UA-25 that seems to do what I want (the problem
> seems to be the USB 1.0 interface). Since the pedalboard as digital
> audio output, I thought the M-Audio Audiophile as well (USB version,
> since I'm using a laptop for recording).
> What's your opinion on all this? I'd like to find something that works
> well with Linux, and has MIDI input as well. What are you guys using
> in order to record from effect units?
>
> Thanks in advance,
>
> Cheers,
>
> Pedro
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>
>
Hi Pedro,
my advice is to get the UA-25. Keep in mind that, even if it is
advertised as 96kHz, you can only record or listen at that sample rate
(not both). In duplex mode the maximum is 48kHz. The GT8 digital out is
44.1kHz IIRC, so it is ok.

USB 1 is ok for two channels. You can achieve less latency with PCI
cards, but this is an issue only if you want to monitor the signal
processed inside the application. The UA-25 has a direct monitor (0
latency) that you can use to listen to your processed guitar while
playing over a track.

UA-25 works OOTB with linux (MIDI works great too).

Hope this helps,

-c.
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--
Arda EDEN
Cumhuriyet University
Faculty of Fine Arts
Department of Music Technology
Sivas/TURKEY