Hololens app does not work when 'Spatialize' in AudioSource is enabled using Heavy framework.

I am using Heavy from Enzien Audio, for my Pure Data patches within Unity, to finally build a Hololens app.

When I disable the audio spatialization, the app runs fine on the Hololens emulator. But as soon as I enable the spatialization, the build does not work anymore on the emulator. When I use a .wav file (so not making use of Heavy) and enable the spatialization the Hololens app also works. Therefore it seems that there is a problem between Heavy and the 'Spatialize' option.

Can someone help me out with this issue? Or knows how I could contact with the Audio Spatializer SDK developers from Unity?