V/M wrote:bones is mostly correct, except with incoming audio. If you're recording vocals or other real-world sounds via the soundcard, then there will be a difference there. the other difference is that what you hear will affect the decisions you make in mixing..
but still it is true that the quality of the soundcard has no direct effect on the quality of the audio files produced by Orion.
You forget to add 'Midi latency' to the other difference list. If you record a midi keyboard then an ASIO card is the thing to have ! midi have no latency but as the messages are usually used by audio apps, if you have to deal with a windows audio or dx drivers, what you play will be delayed accordingly to the buffer size ( usually bigger with non-ASIO drivers). With an ASIO card the "midi latency" is minimized ( even if there is no midi latency, but I thing you all get that it's slaved to the audio in a way).
If you don't need to record multi channel audio you can look at
*M-Audio 24/96 or 24/192 ( even if working at 192 kHz could be a probelm with many VST )
*ESI-Julia ( said to have a good freqeuncy responce 'transparent spectrum', but ESI is a bad company with consumer support,and their driver update)
* E-MU 0404: I have noting to say about this one as I don't know it ( contrary to the 2 previous one). Technically you have a big difference; a built in dsp processor to run effect on... but I don't know if it's really intersting.
*You also have some card in the price range you want from AudioTrak
these products are PCI cards, 2 mono I/O only and price<100 bucks. If I were you I would take an M-Audio one or maybe the E-MU ?