You can program the tones for all VDIs individually. So if you want the audio to sound a low tone for targets below -20 (for example), you can set the tones for targets -20 and below to the low tone. For targets -19 and above, set the tones higher. You can customize your tones however you wish. I just used -20 as an example. You can set up multiple regions with varying tones. How to make the settings you wish has been explained very well by Steve Herschbach (I probably misspelled his name though) in earlier posts so search for his posts on this. Open up discrimination all the way so that you can hear the low tones and the high tones. If you don't open up discrimination, targets below the discrimination level will go quiet.
You can adjust how fast to make it autotrack. You can turn off autotracking like in the MXT as well. You can also set the recovery speed fast enough to get you in trouble.
But, it will not sound exactly like an MXT. It is not an MXT - both software and hardware are completely different. So, it won't act exactly like an MXT either. You should be able to set up the settings to your taste and have the results that you're looking for though..