Sound is produced by the electronic Tanpura (brand: Raagini), a drone instrument used in Indian classical music. Several recordings are done at different settings of the electrical instrument (e.g. different types of tuning, tempo, equalization etc).
More about this instrument: http://en.wikipedia.org/wiki/Electronic_tanpura
Tuning used: pa SA SA sa
Frequency of SA: ~130.8 Hz (C)
Recoding Technique: Line in
Equalizer knob: fully towards ladies (high treble)
Picture of the instrument: http://www.flickr.com/photos/sankalp_gulati/7175106556/in/photostream
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