S4 - Crossfade Between Two Scales and Apply Controlled Ran

VIDEO DESCRIPTION:

Play, download and edit the free video S4 - Crossfade Between Two Scales and Apply Controlled Randomness to a Melody a.k.a Project Jaded Anube.

This patch, assembled for assignment 4 - “Crossfade Between Two Scales And Apply Control Randomness to a Melody” and dubbed as “Jaded Anube” (since it derives most of the melody in it’s presentation from “Blue Danube”, before being whacked into randomness), is comprised, besides the original devices which have been adapted and extended, such as the reference messages and the database for scales, of two tuning devices, one for Twelve-Tone Equal Temperament (12-TET) (on the lower left quadrant) and other for Just Intonation (JI) (on the lower right quadrant), each possessing calculations for frequency in hertz, cents, savarts and the interval quotient.

While the interval quotient for the 12-TET is derived from the number of the semitone (after transposition, in case it’s taking place) which is valued at 1.059463094 per semitone on a logarithmic scale, the interval quotient for JI is taken directly from the acoustic interval ratios derived from the harmonic series. Further calculations have been put in place to display the degree of the deviation from the natural tuning (JI) by the temperate tuning (12-TET) (on the lower left corner).
It is possible to crossfade between these two tuning systems by using the “tuning x-fader” slider.

Due to the implementation of JI as a tuning device, the original “justmajorscale” has been defaulted while four improvised scales (i.e. improvised 1 through 4) have been inserted into collections, which were placed in the “Database of Scales”, as well as a failed attempt at deriving a scale from the relationship between harmonic numbers and octave numbers (i.e. failure major), kept in place to honor error and “experimentation’s sake”, which the patcher personally thinks may have a certain relationship with randomness, thus furthering the case for it’s permanence inside the patch.

A random engine containing three devices:
• A “random note change device”, that inserts random notes into the melody being played and
which is controlled by a “scale degree offset” of ± the number of steps (i.e. both + and - in order to keep it balanced);
• A “random pause device”, which inserts random pauses into the melody and which probability percentage may be controlled with the “random pause probability” slider or number (i.e. 0% for no pauses and 100% for silence);
• A “random tempo shuffler device” which automatically divides randomly the notes being inserted by the “random notes device” into each melody note, thus turning quarter notes into eight notes for instance, and also in a certain proportion, controlled by the “random tempo shuffle time interval multiplier” number, which scales the activity of the “random tempo shuffler device” (i.e. it multiplies the “clock” at which the “random tempo shuffler device” is working).

All this devices may work in conjunction with each-other, or solely, through toggle control. All of them are activated or deactivated simultaneously through the “random engine toggle”.

Other controls, besides the original “tonic/key note” number, which of course has been kept, is the transposition by number of steps, “# steps transposition” number, which creates an offset on the tonic semitone numbers.

Above the “tuning xfader” slider, already mentioned, is the “scale xfader” slider which makes for the possibility of interpolating between two scales as the melody plays. The melodies can be assigned to either side A or B of the crossfader, by selecting them from the tabs “scale A” and “scale B”. The crossfading devices, for each one of this crossfading sliders, make use of LERP formulas to perform the interpolation.

Two graphical elements have been added to the canvas, one being the jit.turtle, which has messages for forward movements, right and left turns, and changes of direction connected with the “random engine” devices, thus displaying random tracks on the jit.pwindow whenever randomness is active. The other, the nslider, which displays the 12TET note currently being played on the staff.

Regarding the sound synthesis it remains a monophonic saw but, being processed through the bp.Gigaverb in order to increase the sense of sharpness of the sound.

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