Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.
Download on the App StoreAudiobus is the app that makes the rest of your setup better.
PSA-Reason kHs Toolbox
Not sure about the details, but I was logged in to Reason this evening and noticed that the Kilohearts RE toolbox was free https://www.reasonstudios.com/shop/bundle/kilohearts-toolbox/
Comments
aaand kHs ONE synth https://www.reasonstudios.com/shop/rack-extension/kilohearts-khs-one/
KHs made most of their VST/Au stuff free, too. Only exceptions are Phaseplant, Multipass, the 2 more complex EQs, Disperser and Faturator, if I'm not mistaken. Lots of fun to be had with Snapheap and the full free package of snapins.