Impulse response types include several slow and fast sine sweeps as well as specific audio signals for established reverb plugin-ins like Waves IR-1 or Altiverb. 1. Step: Choose your IR type. 2. Step: Set your recording length (accordingly to the IR type length) 3. Step: Press record and wait for the results! Please note: For the best results use an external speaker device capable of higher volume playback and record in quiet spaces.