Allow any audio setup for midi_inverter

plugins/examples/midi_inverter/src/lib.rs

@@ -40,6 +40,12 @@ impl Plugin for MidiInverter {
         self.params.clone()
     }
 
+    fn accepts_bus_config(&self, _config: &BusConfig) -> bool {
+        // This is a zero channel plugin, but the host can configure it to pass through audio as
+        // needed. Ableton Live for instance doesn't support note effects.
+        true
+    }
+
     fn process(
         &mut self,
         _buffer: &mut Buffer,