You need to get your system to register your standalone as a Rewire device. If you're on a mac, you can try the following:
1. Control-click on the standalone, and select ‘show package contents’.
2. Select Contents/support/ad/MSPReWireDevice.bundle, and make an alias.
3. Drop the alias into the ~/Library/ApplicationSupport/Propellerhead Software/ReWire folder.
When you first run your standalone and select the ad_rewire driver, it is supposed to place it’s own alias to the package’s Rewire bundle, renamed “your_app Rewire device” (where ‘your_app’ is the name of your standalone), but Rewire can be a bit flakey about this.