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02-score-calls.py - Sequencing the function calls.
============================================================================================================================================
The Score object takes in input an audio stream containing integers
and any time the integer changes, it calls a function with a generic
name to which the integer is added. This allows the user to build a
sequence of functions and to control how and when each one is called.
This example uses a metronome and a counter to generate a stream of
integers at a specific rate. The called functions change the oscillator
frequencies to produce a chords sequence.
.. code-block:: python
from pyo import *
s = Server().boot()
# A four-streams oscillator to produce a chord.
osc = SineLoop(freq=[0, 0, 0, 0], feedback=0.05, mul=0.2)
rev = WGVerb(osc.mix(2), feedback=0.8, cutoff=4000, bal=0.2).out()
def set_osc_freqs(notes):
# PyoObject.set() method allow to change the value of an attribute
# with an audio ramp to smooth out the change.
osc.set(attr="freq", value=midiToHz(notes), port=0.005)
# The sequence of functions (some call set_osc_freqs to change the notes).
def event_0():
set_osc_freqs([60, 64, 67, 72])
def event_1():
pass
def event_2():
set_osc_freqs([60, 64, 67, 69])
def event_3():
pass
def event_4():
set_osc_freqs([60, 65, 69, 76])
def event_5():
pass
def event_6():
set_osc_freqs([62, 65, 69, 74])
def event_7():
set_osc_freqs([59, 65, 67, 74])
# Integer generator (more about triggers in section 12-triggers)
metro = Metro(time=0.5).play()
count = Counter(metro, min=0, max=8)
# Score calls the function named "event_" + count. (if count is 3,
# function named "event_3" is called without argument.
score = Score(count, fname="event_")
s.gui(locals())
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