MIDI Violin/Pitch Bend/Controlers

Does anybody have information about what would be the
best equipment to use to get the signal of a Violin
process into MIDI files with good accuracy, specially
when playing Karnatic music which is fully melismatic???

Tony Salinas

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>> Csound contains operators for dealing with any equally divided scale,
>> repeating at any interval in teh score; it also has facilities for
>> handling non-equal scales at any repeat interval. This has been there
>> for a long time now. Look at cpsxpch.
>
>Thanks John. I have looked at cpspch. It seems to me to be related to
>pitch class, which is inherently related to modulo-12. For that reason, I
>tried another way. I thought it was more exact (and therefore less likely
>to mislead) to use modulo-7 numbers, rather than modulo-12.
>
John referred to cpsxpch, not cpspch. Here's what it says in the 3.44
release notes:

b) Tuning Opcodes (John Fitch)

icps cps2pch ipch, iequal
icps cpsxpch ipch, iequal, irepeat, ibase

Converts a pitch-class notation into cycles-per-second for equal
divisions of the octave (for cps2pch) or for equal divisions of any
interval. There is a restriction of no more than 100 equal divisions.

INITIALISATION

ipch - Input number of the form 8ve.pc, indicating an `octave' and
which note in the octave.

iequal - if positive, the number of equal intervals into which the
`octave' is divided. Must be less than or equal to 100.
if negative is the number of a table of frequency multipliers

irepeat - Number indicating the interval which is the `octave'. The
integer 2 corresponds to octave divisions, 3 to a twelveth,
4 is two octaves, and so on. This need not be an integer,
but must be positive.

ibase - The frequency which corresponds to pitch 0.0


It is possible to accomplish the same thing without cpsxpch or cps2pch.
Here's an example for 7-TET, since you asked about 7 tones to the octave:

instr 1
ioct int(p5) ; the octave
ipchclass 100*frac(p5) ; the pitch class # (00-07)
ifreq cpsoct(ioct+ipchclass/7) ; covert it to oct format
.. ; go on to use ifreq as normal

If you want a fixed but not equally tempered scale, then you can store the
factors in a table and use a negative iequal parameter in cps2pch:

f 1 0 16 -2 1.000000 1.066667 1.125000 1.200000 1.250000
1.333333 1.406250 1.500000 1.600000 1.666667 1.777778 1.875000

instr 1
ifreq cps2pch p5,-1
...

This table will give you 5-limit just intonation for a 12-tone scale.

To effect more general just intonation, Lydia Ayers posted an example some
months ago of how to send the fundamental, numerator, denominator, and
octave to the instrument as p-fields. This way you don't have to mess with
pitch class notation at all.

Best of luck.

Bill

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^ Bill Alves email: alves@hmc.edu ^
^ Harvey Mudd College URL: http://www2.hmc.edu/~alves/ ^
^ 301 E. Twelfth St. (909)607-4170 (office) ^
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