Recording took three months to complete, with sessions often lasting up to sixteen hours a day. Czukay would edit these long, disorganized jams into structured songs. Czukay used only two two-track tape recorders to capture the sessions. Because of the limits of two-track recording the group favoured the castle's high-ceilinged entrance hall, an architectural reverb chamber, using the natural acoustics and placing the microphones optimally relative to their instruments. Due to the intense reverberation, Czukay took advantage of the sonic bleed and limited the band to three microphones, shared between vocalist Damo Suzuki and drummer Jaki Liebezeit. Keyboardist Irmin Schmidt experimented with sine-wave generators and oscillators in place of typical synthesizers on "Aumgn".