If your recording with it, you would want the compressor before it reaches your sound card's converters. Because if it reaches your converters first and it clips before hitting the compressor, the damage is done and cannot be reversed. I'm assuming you want it to tame the dynamics and avoid clipping when recording, right?
If i was you, i would just record it dry and compress it to taste after the fact. Because in 24bit recording, you do not need to record as hot as you would in 16bit. So if your reason is to avoid clipping when recording, you do not need the compressor.
Also, if you do compress it when recording and you find out the attack time was to fast or the release time was too slow, you cannot undo it. If you add it after the fact in the program, you can adjust it to taste and undo any settings you may need in the future.
I may have went a bit over what you asked, but i think you may need this info
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