Using more than one input signal in a single expression — Pyo 1.0.4 documentation

Pyo 1.0.4 documentation

# Using more than one input signal in a single expression

03-multiple-inputs.py

It is possible to give a list of audio signals to the input argument if you need more than one signal in your expression.

You can either pass a list of audio objects (as in the complete example below) or a single multi-streams object, as in:

    sig = Sine(freq=[10.7647, 10.0000, 87.9023, 296.4831])
    ex = Expr(sig, "(* (* (* $x[0] $x1[0]) $x2[0]) $x3[0])").out()

If multiple signals are used, the position in the list must be given between the $x and the sample position [0]. So, for the second audio signal, one would retrieve it with $x1[0]. The 0 for the first signal can be ommited, $x[0] is the same as $x0[0].

## Complete example

    from pyo import *

    s = Server().boot()

    expression = """
    // Four signals ring-modulation.
    (* (* (* $x[0] $x1[0]) $x2[0]) $x3[0])
    """

    # Multiple input signals.
    s1 = Sine(freq=10.7647)
    s2 = Sine(freq=10.0)
    s3 = Sine(freq=87.9023)
    s4 = Sine(freq=296.4831)

    # Create the Expr object and show its expression editor. To
    # re-evaluate the expression hit Ctrl+Enter when the editor
    # has the focus.
    expr = Expr([s1, s2, s3, s4], expression, mul=0.5)
    expr.editor()

    # Shows the generated signal.
    sc = Scope(expr)

    # Converts the mono signal to stereo and sends it to the soundcard.
    pan = Pan(expr).out()

    s.gui(locals())