Please make sure you have the latest version of Zebra from Uhe. Get Zebra Here. Apart from Serum by Xfer this is probably my most loved synth but least used. I often find presets to be epic or pants but the engine underneath is capable of amazing sounds with minimal CPU hit, especially super saw sounds. It’s a little too advanced for it’s own good! Please support and buy the synth if you can, developers of audio stuffs are rarely rolling in cash.