You can have as many FFT/iFFT's as your device will permit.
If you can't see the new Spectral category, check the community, that's where the vocoder example lives. Some people backed their scenes up (via FTP) then did a fresh install of Jasuto to get all the new scenes...
For the Scale node, check in the Instruments category under 'holyPluck'. To create a new Scale node you'll find it in the Create->IO menu, all the FFT stuff is in the FFT menu
Also watch the demo video, you should be able to follow along with that and recreate everything in the initial post.