Code for a TouchDesigner Script CHOP that can generate a signal comparable to the built in “Audio Oscillator” CHOP

script-chop.py

import numpy as np

# press 'Setup Parameters' in the OP to call this function to re-create the parameters.
# The CHOP will not work until you do
def onSetupParameters(scriptOp):
	page = scriptOp.appendCustomPage('Custom')
	p = page.appendInt('Samplerate', label='Sample Rate')
	p.val = 44100
	p2 = page.appendFloat('Time', label='Time')
	p2.expr = 'absTime.seconds'
	p.normMin = 1
	p.normMax = 44100
	scriptOp.isTimeSlice = True
	return

def onCook(scriptOp):
	scriptOp.clear()

	# Measure timing
	sampleRate = scriptOp.par.Samplerate.eval()
	numSamplesElapsed = int(absTime.stepSeconds * sampleRate)

	# Set CHOP settings (sample rate, start / end index) - this logic is designed to mimic the
	# observed behavior of the “audio oscillator” CHOP.
	scriptOp.start = int(scriptOp.time.seconds * sampleRate)
	scriptOp.end = scriptOp.start + numSamplesElapsed - 1
	scriptOp.rate = sampleRate

	# Generate sine wave samples in numpy array
	freq = 440 # Hz
	phase = (2 * np.pi * freq * absTime.seconds) % (2 * np.pi)
	samples = np.sin(2 * np.pi * freq * np.arange(numSamplesElapsed, dtype=np.float32) / sampleRate + phase)

	c1 = scriptOp.appendChan('c1')
	c1.copyNumpyArray(samples)

	return