Hello,
I was looking since a long time how to activate Siri on a SCALA RIDER Q1. I found the solution. Tested on iOS 9.2 on iPhone 5S.
1. Make sur Siri can be enable when your iPhone is on the looked screen (check Settings > Touch ID and Password and activate Siri)
2. Presse simultanously the IC and MM bouton on your scala rider. You will hear a sound, then after a couple about 2-3 seconds the Siri activation sound.
3. Tell what you want to Siri. (after this step, you will then notice that nothing happens),
4. For Siri to obeys your command, BLOW A SHORT, LIGHT PUFF OF AIR INTO THE MIC. Then you will hear the iPhone validation sound. FOOL-PROOF!
(I wonder how Siri interprets that puff of air…)