Eriks Sytrus manual is not outdated at all. It is a useful guide into any use of the synths in FL Studio. The basics explained by Erik are also useful in other synths in FL Studio like Harmor for example.
I converted this manual into a PDF, you find it here: [link]
[3,36 MB (3 528 681 bytes)]. Converted with Eriks permission obviously. I used an OCR package but it was tedious to get things right so It took some time. Added an Index and Table of Contents.