Audulus does not yet export to audio by itself but Audio Share is a great app I'd recommend for this purpose - you host Audulus in Audioshare and it will record straight off it. Also recommend AUM. :) Audio recordinf in-app is something coming in Audulus 4
On the Mac I’ve had pretty good luck with soundflower. It will allow you to route the output from Audulus to another app. I’m looking forward to an update for the plug-in but soundflower is a decent work around
I used soundflower several years ago and liked it. I used it on a MetaSynth demo-you couldn't save your sounds, but with soundflower I just redirected and recorded into Audacity. I have since purchased it. They have replaced soundflower it with "Loopback"-also free. I just downloaded it.