i try to install them all and only remove ones that break or really bother me - its fun to play with things from time to time. in terms of which ones i use:

  - decoders
  - asio output, virtual audio cable setup as needed (but for the most part the output i rarely change anymore)
  - DSPs, audio (i upmix to 7.1 depending on output; but not exactly a requirement due to equalizer apo), video stuff for funzies
  - Network related stuff (control, upnp)
  - theme related stuff though i think this is lacking for my use
  - lots of tooling stuff (though ive slowed down on a lot of that as of lately)

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