For more helpful Sylenth1 tutorials check out http://www.sylenthtutorials.com
I started using Logic as 64 bit only back in version 9. I had too. My projects were getting too large and they couldn't be handled using only 4 GB of ram. I had 8 GB of ram on that computer so it made sense to bite the bullet and switch to 64 bit. When Logic X came out as 64 bit only, it meant I couldn't use one of my all time favorite plugins, Sylenth1.
There were a few other "solutions" to making Sylenth1 64 bit compatible for Mac users. I tried Jbridge, but it was a little buggy and spiked the CPU. It was also a pain to install. But about a month ago I heard about a plugin by Sound Radix called 32 Lives.
It is magic. Just minutes after installing, I had Sylenth1 64 bit compatible and I was using it inside of Logic X! If you have been missing Sylenth1 and haven't found a suitable solution for getting it working in 64 bit, check out this video to see how easy it can be!