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So I have a M-Audio Fast Track MKII, running on AMD 2x 2.70 GHz, 4GB ram. I think I have CPU issues (high cpu usage, crackles, etc). I'm using Ableton live. Is the problem my sound card, the setup or something else?

I was advised to change sample rate to 4096 and now I'm not hearing crackles. Hope it works good now on. So whats your opinion on M-audio fast track when used for producing?