Note: If you are using FL Studio 20, read this article. Note: some NI products can be inserted both as instrument or effect plug-in (e.g. GUITAR RIG 5, SUPERCHARGER, etc.) in an effect insert slot and routing an audio signal to the corresponding Mixer insert track.
MASSIVE, KONTAKT, etc.) in a plug-in channel. This article explains how to insert Native Instruments plug-ins in FL Studio 12, including: