VARP 9 is proprietary audio-video re-synthesis software, developed by GranularSynthesis and Dirk Langheinrich in 1997-1999.

It is a sample based MIDI software instrument that streams from RAM. It works in realtime in full PAL video resolution and frame rate. It allows accessing and allocating single frames at 25f/sec. At this video grain rate it is capable of audiovisual granular synthesis.

The structure of the program resembles in many of its parameters an audio sampler. The specialty of VARP 9 is its flicker engine, which can mix 2 discrete video/sample streams frame by frame, as if 2 videos were intersecting each other.

The MIDI controllable parameters of the program are:

CC 07: general parameter: volume.
CC 11: general parameter: grain sequence direction.
CC 12: general parameter: loop mode.
CC 10: general parameter: ignore note off / follow note off.
CC 70: general parameter: control start points by velocity / CC09.
CC 03: general parameter: shift all loop points.

Note number [00...48]: number of first grain sequence.
CC 09: first grain sequence: start point.
CC 02: first grain sequence: low loop point.
CC 04: first grain sequence: high loop point.
CC 05: first grain sequence: repeat rate per grain.
CC 30: first grain sequence: horizontal shift within array of sequences.

Note number [00...48]+48: number of second grain sequence.
CC 20: second grain sequence: start point.
CC 23: second grain sequence: low loop point.
CC 24: second grain sequence: high loop point.
CC 25: second grain sequence: repeat rate per grain.
CC 31: second grain sequence: horizontal shift within array of sequences.

CC 21: insert grains of second sequence into first sequence: frequency.
CC 20: overwrite grains with silent black or silent white: frequency= amount of grains per insert.
CC 21: insert grains of second sequence into first sequence: difference in amount of grains per insert between first and second sequence.

CC 26: overwrite grains of first/ second sequence with patterns of silent black/ silent white: general frequency.
CC 27: overwrite grains of first/ second sequence with patterns of silent black/ silent white: duration of overwriting partition.
CC 28: overwrite grains of first/ second sequence with patterns of silent black/ silent white:
Creates various patterns of black and white from total black-via total flicker to total white.
CC 29: overwrite grains of first/ second sequence with patterns of silent black/ silent white: Shift overwriting partition.



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