Hi tja,
Thanks for your message.
As stated before, track freeze and mixdown should work fine straight out of the box for many instrument and/or effect plug-ins apps.
For those failing (e.g. due to not having update for some time, other issues) there is the real-time mixdown option.
If you run into track freeze/mixdown issues, please make sure to file a proper bug report to inform the instrument/effect plug-in vendor and us about the problem.
Best,
Lars