Open it up until you’re just barely ‘purring’ on exhale then gently but quickly start to inhale (think of your breath as the bow on a violin). There will be a

Open it up until you’re just barely ‘purring’ on exhale then gently but quickly start to inhale (think of your breath as the bow on a violin). There will be a slight timbre change but cats have that too. It sounds more like a dragon purring than a housecat but close enough.