How can I create a note or chord in python?

Question

Can someone point me to a good library for creating notes and chords in python 2.7? I looked at PythonInfoWiki without much luck, PyAudio just works, and nothing else generates tonality.

Answer 1

I don’t know if this will help, but here is some code synthesizing a complex sound based on frequencies and amplitudes:

import math
import wave
import struct

def synthComplex(freq=[440],coef=[1], datasize=10000, fname="test.wav"):
    frate = 44100.00  
    amp=8000.0 
    sine_list=[]
    for x in range(datasize):
        samp = 0
        for k in range(len(freq)):
            samp = samp + coef[k] * math.sin(2*math.pi*freq[k]*(x/frate))
        sine_list.append(samp)
    wav_file=wave.open(fname,"w")
    nchannels = 1
    sampwidth = 2
    framerate = int(frate)
    nframes=datasize
    comptype= "NONE"
    compname= "not compressed"
    wav_file.setparams((nchannels, sampwidth, framerate, nframes, comptype, compname))
    for s in sine_list:
        wav_file.writeframes(struct.pack('h', int(s*amp/2)))
    wav_file.close()

synthComplex([440,880,1200], [0.4,0.3,0.1], 30000, "tone.wav")

This is the code I use to create notes and chords in python. You have a list of frequencies for the first parameter, a list of amplitudes (the same size as the first), the number of samples and the file name. It will generate a wav file with the specified combination.