|
lab recording, 16.8.1990, 21°C (Sony WM-D3 with QMC mini bat detector at 40 kHz, tape UX-Pro60, tape no. YU6/90:344-421?) lab recording, 17.8.1990, 26°C (Sony WM-D3 with QMC mini bat detector at 40 kHz, tape UX-Pro60, tape no. SO7/90:040-082) lab recording, 17.8.1990, 26°C (Kenwood KX880HX with AKG D202, tape S-MES90, tape no. KW32:16.00-20.00, microphone filter below 100 Hz) |