I mean like NI Komplete, having a great variety of instruments included with some mixing choices like EQ and compression, do I still need to purchase another plugin from Waves or Izotopes for mixing?
Hi,
You'd really need to tell us what you're doing and what you're using but the blanket-statement answer is no. You don't need any plugins/more plugins.
Most, if not all, recording suites come with included plugins. Anything additional would be for particular needs or preference.
Okay, let me specify.
Like the Giant Piano from Native instrument (link below), it has some inbuilt mixing functions like EQ, compressor and reverb. The question is do I still need to buy any plugins, like Izotope's Alloy 2, for mixing? I usually produce pop music.
The first answer still stands, really. You don't need anything but you might prefer to use plugins from a particular company for whatever reason.
Most suites, like I said, come with stock plugins which are capable of all the basic jobs.
When I use VST instruments I do generally find I prefer using additional plugins for eq/comp/reverb but that may simply be instinct/familiarity.
Long story short, you need whatever plugs/tools you need. No one can really tell you what those are.
Personally speaking? I can't imagine not having at least a basic collection of various equalizers, compressors, time-based and modulative effects. *Assuming* your DAW has such things, but I don't know that as fact.
I've found it difficult to use the built-in reverb on Kontakt instruments when I want other instruments to sound like they're in the same space. But EQ, compression, sure - whatever sounds good. I like a smidge of delay on the Session Horns Pro instrument.