Opusmodus 1.1.17982

New:

 

rnd-walk n &key backward forward step start seed

 

[Function]

 

Arguments and Values:

 

n                an integer. Amount of intervals to generate.

backward         a floating-point. The default is 0.5. Maximum 1.0.

forward          a floating-point. The default is 0.5. Maximum 1.0.

step             an integer (an interval). The default is 1.

start            an integer or pitch symbol.

seed             an integer or NIL. The default is NIL.

 

Description:

 

This function returns a series of intervals of given step and probability values (backward and forward). The backward and forward are floating-points in range between 0.1 and 1.0

 

With default values:

-1 with probability backward

 1 with probability forward

 0 with probability 1 - (forward + backward) - same as being stationary.

 

(rnd-walk 16)

=> (1 1 -1 1 -1 1 1 1 1 -1 1 1 1 -1 1)

 

(rnd-walk 16 :start 0)

=> (0 1 0 1 2 1 0 -1 0 1 0 -1 -2 -3 -2 -1)

 

(rnd-walk 16 :start 'c4)

=> (c4 cs4 c4 b3 c4 b3 c4 b3 c4 cs4 c4 cs4 c4 cs4 c4 b3)

 

Examples:

 

Get 16 pitches with :start 'c4 based on a given :seed value and with default step 1:

 

(rnd-walk 16 :start 'c4 :seed 76)

=> (c4 b3 c4 b3 bb3 b3 c4 b3 bb3 a3 gs3 a3 gs3 g3 fs3 f3)

 

In this example the step values are 1 and 2 (randomly selected):

 

(rnd-walk 16 :step '(1 2) :seed 234)

=> (-1 -2 -1 -2 1 2 -2 2 -1 1 -1 2 2 -2 -2)

 

(rnd-walk 16 :step '(1 2) :start 'c4 :seed 234)

=> (c4 b3 a3 gs3 fs3 g3 a3 g3 a3 gs3 a3 gs3 bb3 c4 bb3 gs3)

 

In the next two examples the probability to move forward is bigger then going backward.

 

(rnd-walk 16 :step '(1 2) :backward 0.3 :forward 0.9

             :start 'c4 :seed 234)

=> (c4 b3 cs4 d4 e4 f4 g4 f4 g4 fs4 g4 fs4 gs4 bb4 gs4 fs4)

 

(rnd-walk 16 :step '(1 13) :backward 0.3 :forward 0.7

             :start 'c4 :seed 234)

=> (c4 b3 c5 cs5 d6 eb6 e7 eb6 e7 eb7 e7 eb7 d6 cs5 d6 eb7)

 

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Bug fix in EXPAND-CHORD-NAME

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All Contributes to Opusmodus are acknowledged now in the "About Opusmodus" window.