Troubleshooting

Open the RasterFX app once, all the way to the main screen. iOS only registers an Audio Unit after its container app has been launched, so a fresh install is invisible to AUM, GarageBand, Logic and everything else until you do. This is the cause almost every time.

If it still isn't there:

• Look under effects, not instruments. RasterFX is an audio effect that also accepts MIDI, so some hosts list it in a submenu.
• Open Settings › About in the app and tap the Plug-in row. It runs a live check and says what it found — that line is the fastest way for us to tell what is wrong.
• Some hosts only rescan on launch. Quit the host fully and reopen it.
• If you have just updated, restarting the device forces iOS to rebuild its Audio Unit registry.

Open the RasterFX app once. The plug-in cannot talk to the App Store itself — when your host loads it, it is not running as the app — so it reads your unlock from a file the app writes. Opening the app once writes it.

Then close the plug-in's window in your host and open it again; it re-reads your licence every time the window appears, so you do not need to reload the session.

Your saved work is never affected by this. A patch made in Pro always plays back exactly right, even on the free version — all six slots, all sixteen modulation lines. The free version limits what you can edit, never what you can hear.

Open Settings › Plan and tap Restore. If nothing happens, check that you are signed in to the Apple Account you bought it with. More in Restoring a purchase.

If the app says "Microphone access is off", turn it on in the iOS Settings app, under RasterFX. If you hear a howl instead, that is the built-in mic picking up the built-in speaker. Connect headphones.

Free takes stop at 60 seconds, and the app says so while you record. Record in two takes, or get Pro for takes of any length. See Recording.

Please include these — they turn a guess into a fix:

• The version and build, and the Plug-in line, all three in Settings › About.
• Your device and iOS version.
• If it involves a plug-in: which host, and whether the same thing happens in the standalone app.
• What you did, what you expected, and what happened instead.