The Neuer Dom of Linz, built between 1862 and 1924, has 3 organs. One of them is not functional at this point, and I'm not sure if they have plans to fix it. The first photo is the organ at the front of the church and built by an Austrian. I heard it used during mass. The large organ at the back was built by a Dutch organ builder. It's an amazing organ. Andrea Marcon performed a recital on it of early music. Very very good. The acoustics in the cathedral are just wonderful. I don't know what the official number is, but I counted about 6.5 seconds several times during the recital.