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"""
Setting audio object parameter's value with portamento
**03-set-method.py**
The set() method of the PyoObject lets the user define a new
value for a given parameter with a portamento time to reach
the target. Optionally, a function to call at the end of the
ramp can be given to the `callback` argument.
The signature of the method is::
PyoObject.set(attr, value, port=0.03, callback=None)
Where:
- `attr` is the name of the attribute as a string.
- `value` is the target value (can be a list if object has
multiple streams).
- `port` is the portamento time in seconds.
- `callback` is a function to call when the ramp is done.
"""
from pyo import *
from random import uniform
s = Server(duplex=0).boot()
# 10 frequency modulations with random parameters.
a = FM(
carrier=[uniform(197, 203) for i in range(10)],
ratio=[uniform(0.99, 1.01) for i in range(10)],
index=[uniform(5, 10) for i in range(10)],
mul=0.05,
).out()
def go():
"Linear ramps between the current values and the new ones in 9.5 sec."
# Choose new targets and start the ramps.
a.set("carrier", [uniform(395, 405) for i in range(10)], 9.5)
a.set("ratio", [uniform(0.49, 0.51) for i in range(10)], 9.5)
# Call the reset() function when portamentos are done.
a.set("index", [uniform(10, 15) for i in range(10)], 9.5, callback=reset)
def reset():
"Instantaneous jumps to new values."
a.carrier = [uniform(197, 203) for i in range(10)]
a.ratio = [uniform(0.99, 1.01) for i in range(10)]
a.index = [uniform(5, 10) for i in range(10)]
# Call the go() function every 10 seconds.
pat = Pattern(go, time=10).play()
s.gui(locals())
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