def start(cls, args: List[str]) -> "Echo.Filter":
args = [a.strip() for a in args if a.strip()]
if len(args) < 2:
raise Exception('Missing parameters <scale> <pause> ... ')
scale = parse_perc(args[0])
pause = float(args[1])
return Echo.Filter(scale, pause)
def start(cls, args: List[str]) -> "Crackle.Filter":
args = [a.strip() for a in args if a.strip()]
if not args:
raise Exception('Missing parameter <factor> ... ')
return Crackle.Filter(parse_perc(args[0]))
def start(cls, args: List[str]) -> "Volume.Filter":
args = [a.strip() for a in args if a.strip()]
if not args:
raise Exception('Missing parameter <factor> ... ')
n = args[0].strip()
return Volume.Filter(parse_perc(n))
def start(cls, args: List[str]) -> "Noise.Filter":
args = [a.strip() for a in args if a.strip()]
if not args:
raise Exception('Missing parameter <amplitude> ... ')
return Noise.Filter(parse_perc(args[0]))