import sys

sys.path.insert(

0, f"{__file__.rpartition('/')[0] or '.'}/../../../../frozen/Adafruit_CircuitPython_Wave"

)

import random

import audiocore

import synthio

from ulab import numpy as np

import adafruit_wave as wave

random.seed(9)

envelope = synthio.Envelope(

attack_time=0.15, decay_time=0, release_time=0.08, attack_level=1.0, sustain_level=1.0

)

SAMPLE_SIZE = 1024

VOLUME = 14700

sine = np.array(

np.sin(np.linspace(0, 2 * np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME,

dtype=np.int16,

)

noise = np.array([random.randint(-VOLUME, VOLUME) for i in range(SAMPLE_SIZE)], dtype=np.int16)

bend_out = np.linspace(0, 32767, num=SAMPLE_SIZE, endpoint=True, dtype=np.int16)

def synthesize(synth):

for waveform in (sine, None, noise):

for biquad in (

None,

synth.low_pass_filter(120),

):

for midi_note in range(24, 90, 3):

n = synthio.Note(

frequency=synthio.midi_to_hz(midi_note),

envelope=envelope,

filter=biquad,

waveform=waveform,

bend=synthio.LFO(bend_out, once=True, rate=1 / 2, scale=5),

)

synth.press(n)

print(n.frequency)

yield 24

synth.release_all()

yield 16

yield 24

yield 48

with wave.open("biquad.wav", "w") as f:

f.setnchannels(1)

f.setsampwidth(2)

f.setframerate(48000)

synth = synthio.Synthesizer(sample_rate=48000)

for n in synthesize(synth):

for i in range(n):

result, data = audiocore.get_buffer(synth)

f.writeframes(data)