Your talking about latency. The length of time it takes for the PC to recieve the audio data and process it through the soundcard.
There are 2 possible ways of helping this.
1. Go into the audio settings on mixcraft. There should be a latency option. Try adjusting that to a lower value. You can lower it until you hear clicking when you play. That is a sign that the PC is not keeping up and it needs to be higher. You want to have it on the smallest number where you can hear clear audio.
2. Make sure you have the ASIO drivers installed
. I CANT STRESS THE IMPORTANCE OF THESE DRIVERS ENOUGH. ASIO is an audio driver thats capable of extremely low audio latency as it bypasses all the windows processing. Try asio4all at
ASIO4ALL - Universal ASIO Driver To use it you can select the asio driver in mixcraft as your output device instead of your fasttrack interface. It will still route it correctly as you configure the output device in the asio control panel.
This may sound rather complicated, but it's quite easy once you get to grips with it. I'm sure someone else will be along with other recommendations if mine dont work.