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field recording, 28°C, sunshine (Sony WM-D3, QMC mini bat detector at 25 kHz, tape: Sony UX-Pro90, tape no. SO1/93:074-100) field recording, 28°C, sunshine (Sony WM-D3 with small Sennheiser stereo, tape: Sony UX-Pro90, tape no. SO1/93:100-124, bandpass about 10-15 kHz strongly filtered) |