Timo, I tested this today, too. The answer is, "Yes."Can the Rumble Studio USB Audio Out Interface be used on an iPad? I mean, to record on Garage Band , DAW etc. Has anyone tried that? Does it work?
I have a Rumble Stage 800. The Stage 800's USB audio out is the same as the one on the Studio 40. To connect it to the iPad you need an adapter plug that converts the USB-A end of the cable coming from your Rumble Studio 40/Stage 800 to the plug receptacle type your iPad has. The receptacle could be the original 30-pin plug or the "lightning" plug on the iPads, or the new USB-C plug on the iPad Pros. These are available from Apple and other manufacturers. Some have additional ports that let you also connect a power cable to power your iPad simultaneously.
I connected my Stage 800 to my iPad Pro via a USB-A-to-USB-C adapter. I had the amp on with GarageBand running on the iPad and open to the Audio Recorder instrument. GarageBand immediately asked me if I wanted to use the amp as my audio source. It setup the track to use the input device and turned on monitoring. From there, everything worked as you'd expect.
I created a quick demo project using the Smart Drums, and recorded 3 bass tracks using effects on the Stage 800 to make sure they were recording, too. It worked perfectly. Here's a link to the GarageBand test project in DropBox.
Hope this helps.
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