import mapper
def freq_handler(sig, id, val, timetag):
    try:
        print val
    except:
        print 'expection'
        print sig, val
dev = mapper.device( 'pyo_example' )
dev.add_input( '/freq', 1, 'f', "Hz", 20, 20000, freq_handler)

while True:
	dev.poll( 100 )