To use these plugins, you will either have to grab a test build
which fixes the plugin bridge for those plugins, or you should just keep using the 32-bit version. Seeing that you are apparently making chiptunes, you really don't need to use the 64-bit version. As the download page says, you really only should be using it if you need the extra available RAM, or if you have lots of 64-bit plugins. The plugins you are using are 32-bit ones, so they have to be bridged, and bridging plugins will add a lot of latency. If this latency is too high, the sound will stutter. So in your case, there's really no advantage in using the 64-bit version.