Is it possible to tweak the OSX application code to make it work on Mojave?

Question

macOS

Bottom line: There is a Firewire audio interface that was released in 2007. It is detected without problems in my Mojave system, but for full-fledged work, you need to change the audio output settings in a special utility. This utility is no longer supported and is not updated. On Mojave, it starts but doesn't function properly (it's just a selector with options to choose from, and the selector just doesn't get clicked). Works in High Sierra.
Since the utility is quite simple in terms of functionality, I thought that perhaps for people who develop applications for poppy, it would not be difficult to look at its code and say if this problem can be solved.
Link to the utility on Yandex Disk