def rising_chords(vol=1, tremolo=False, echo=False):
'''Simple test wave, similar to rising(), but with chords and effects.
Args:
vol - set volume between 0 and 1
tremolo - enable or disable tremelo
echo - enable or disable echo
Returns:
None
'''
tremolo_freq = 5 if tremolo else 0
time = timing.Timing(175, 3)
abc_notes = ["C, D, E, F,|G, A, B, C|D E F G|A B c d|e f g a|b c' d' e'|f' g' a' b'| c'']",
"E, F,|G, A, B, C|D E F G|A B c d|e f g a|b c' d' e'|f' g' a' b'| c'']",
"G, A, B, C|D E F G|A B c d|e f g a|b c' d' e'|f' g' a' b'| c'']"]
# hacking around the fact that abc.c doesn't parse chords yet
notes = zip(*map(abcp.parse_str, abc_notes))
chords = [[note[0] for note in chord] for chord in notes]
# play the wave
pa, stream = play.open_stream()
wave = BeatingSynth(time, chords, detune=1, vol=.3,
tremolo_freq=tremolo_freq)
if echo:
wave = effects.echo(time, wave, vol=0.3, delay=1/4)
play.source(stream, wave)
play.close_stream(pa, stream)
def _post_process(self):
'''Effects added to the instrument. They can linger beyond notes.'''
if self._tremolo_freq > 0:
self._wave = effects.tremolo(self._wave, self._tremolo_freq)
if self._slow_intro:
attack = adsr.linear_envelope(0, 1, self._total_dur)
self._wave = mixer.multiply((self._wave, attack))
self._wave = effects.echo(self._timer, self._wave, .2, 1/4)
