Custom MixMonitor filenames?

Greetings!

I am looking for a way to change the default filename passed to MixMonitor. I cannot seem to find a way to do it within the GUI, and have been unable to find it within the config files themselves.

Could someone be so kind as to point me in the right direction? I have no problems manually editing a config file if needed (which hopefully will not get overwritten after an update).

Thanks in advance,
Jay