Little ocarinas can pack quite a punch. Here’s an excerpt from Franz Schubert’s Die Forelle (The Trout) on a four-hole diatonic chickarina.
Own an ocarina and have trouble getting a decent sound? Check that your lips aren’t covering the voicing hole (the hole between the windway and the bevel), make sure fingering holes are fully covered/uncovered (vs. partially covered), and try increasing or decreasing the wind speed.