Samplitude & Kontakt 4 Drums Part 1: Assigning Multiple Output Channels - YouTube
This introduces the 4 part series and is followed by a tutorial showing how to add extra multiple outputs in Kontakt and Samplitude.
Home Recording Studio Build It Like The Pros
(Second Edition) by Rod Gervais . This book teaches you how to do all these things, from building a professional home studio to saving thousands of dollars in the process.