Hi fragment
the same here with my RepulseGold . . .quite and simple.
You can do the job, with all Amiga soundcard as well. (use a free internal input connector)
When an Amiga Paula output is active, it will be redirected to the soundcard output as is. (throughput).
If (as all) the soundcard has a Mixer/Preference GUI, you must enable the related soundcard input line (and its level). i.e AUX-IN, VIDEO-IN, CDROM-IN etc.
Ciao