The audio engineers were: Joe Ferla (tracks 1–2, 5–6, 9–12); Alec Head (tracks 3–4); Katuyuki Igarashi, Tsuro Ogawa (tracks 7–8).
The audio engineers for tracks 1 to 2, 5 to 6, and 9 to 12 were Joe Ferla; tracks 3 to 4 were handled by Alec Head; Katuyuki Igarashi and Tsuro Ogawa worked on tracks 7 to 8.