There is currently a compatibilty issue with Duende in Mac OS 10.5 - Leopard. This issue manifests itself as fast audio drop-outs over tracks processed by Duende plug-ins. SSL will provide a fix for this as soon as possible. Please click the 'Notify Me if this answer is updated' tab below to be informed of when a fix is available. We recommend using Mac OS 10.4.10 which has been tested succesfully with Duende v2.2 software until the issue is resolved