Need programming help for computer generated walking bass

[TJ]

Hey,
I'm a composition student working on a project in Digital Jazz.
I have no programming knowledge whatsoever but am trying to create a program in miniAudicle that will act as a computer generated walking bass.

I've got this so far:

SinOsc ge=>dac;

while( true )
{
Math.random2f(30.8,164. => ge.freq;
.2::second => now;
}


But it would be great if someone could explain how I can get the computer to choose random frequencies based on a list (the list being the frequencies of the triad of a particular chord).
I will also want to be able to change the list after a certain duration of time (ie. when the chord changes).
Not sure if this is possible but just thought I'd ask anyway.

Thanks!

[MusicMan11712]

I can't tell you how to do it in ChucK, but for an arduino program that generated midi notes (as oppose to sounds), I used arrays of acceptable note values and an acceptable octave range (as well as a few CCs for timbral shaping, etc.). I then had my program choose a randomized offset to the one of my pre-determined arrays. That then gave me my midi note number.

I assume you can do something similar with frequencies to be used with ChucK.

Just a thought in case it spurs some creativity to help solve your task.

Steve

[Lueasy]

I suggest you check out arrays.

For example, a midi C major scale array would look like this:

[60,62,64,65,67,69,71,72] @=> int scale;

Then to convert midi to frequency, use the standard library as such:

Std.mtof(scale) => ge.freq;

Then to chose those values randomly, remember arrays start with 0 and go for however many values you have. In this case 7.

The full scale program could look as such:

[60,62,64,65,67,69,71,72] @=> int Cscale;

While(1)
{
Math.random2(0,7) => Cscale;
Std.mtof(Cscale) => ge.freq;
0.2::second => now;
}