I know it’s dumb, but the playback can sound metallic if the iPad mic accidentally records an audio track from the monitors/speaker on an adjacent track, along with whatever you’re actually doing. Cubasis defaults to the built-in mic if none is selected and it’s easy to accidentally ARM other tracks when you’re in the heat of a recording session. Would happen less if the ACTIVE track was more obvious, but the current highlighting is a little too subtle. Shouldn’t be any ambiguity at all!