- Use a long audiorecording
- Put the Corpus effect on it and select as resonance type for example String
- Use the sidechain of the Corpus effect and select a Midi from track where midi notes are played.
- Play the midi track + audio track together to hear the effect of the drone
- Play with the corpus parametes like Decay, Transpose; Resonance Type.
- Put effects after the Corpus for more weird sounds: Auto Filter or Reverb or Delay, … Be creative!
My ambient drone demo: