Cannot find a way to send signal to a specific ouput

I have a Lexicon Omega Audio interface. I have written a small program from examples to send a sinewave to the output through MME. This works. I have had a go at selecting an ASIO output and using the channel_selector argument, but no luck. I get invalid number of channels. Is there a way I am missing to be able to pass an argument that says I want outdata to go to a specific output of the device I am using?

import sounddevice as sd
import numpy as np
import scipy.stats as ss
import queue

asio_out = sd.AsioSettings(channel_selectors=[1, 2])

out_q = queue.Queue()

global start_idx
start_idx = 0

def callback(outdata, frames, time, status):

    global start_idx
    t = (start_idx + np.arange(frames)) / 48000
    t = t.reshape(-1, 1)
    sine = 0.9 * np.sin(2 * np.pi * 1000 * t)

    outdata[:] = sine
    out_q.put(sine)

    start_idx += frames

with sd.OutputStream(device=24, samplerate=48000, channels=4, blocksize=4096, callback=callback, extra_settings=asio_out):
    while True:
        pass

Thanks in advance.

[mgeier]

I guess this issue is resolved, right?

[mgeier]

Great that you found the solution yourself!

For the “explicit” case you could also write: outdata[:, :] = data, which does the same if outdata has 2 channels.

In the “one channel” cases, the inner brackets are not necessary, you can write: outdata[:, 0] = data, which I think would be more idiomatic.