Наконец-то голланцы ожили.

наверно их задолбали пользователи вопросами (я в том числе)

http://www.lennardigital.com/modules/home/

23 July 2013 Recently we receive a lot of questions about how to run Sylenth1 in 64bit hosts on OSX, such as the new Logic X and Ableton Live 9. We are still working on a 64bit version of Sylenth1 and we're hoping to get it done before the end of this year. Until then there are a few options to run Sylenth1 in these hosts. You can find an example walkthrough here. For Ableton Live it is recommended to use the 32bit version of Live to run Sylenth1. If you still need the 64bit version, you can use JBridge to run Sylenth1.

ну и кто с гемором хочет подключить Sylenth1 и Logic X все сюда:

http://www.macprovideo.com/hub/logic-pro/how-to-run-32-bit-plug-ins-in-logic-pro-x

З.Ы. я решил подождать до 64 бит