I am trying to use the Justboom Amp Zero as crossover. Therefore I have to route the signal of one stereo-channel to both amp-channels. This is working fine by adding the following to my asound.conf:
You can use our Lowpass filter integration and its structure as model for yours (reuse and replace our pcm with yours). Just click „install“ in the last paragraph of our Audioplayer plugin and it is installed. You can also check out our github for more details.