[pygame] play sound delay

[yu]

hi,all

My function is

press keyboard then in the event "KEYDOWN" play the sound (*.midi  *.wav ...)

I need the sound play immediately but  it seems always has about 1 second delay

how to solve these?

my code like these:

pickUpSound = pygame.mixer.Sound('/home/yu/work/symphony/pickup.wav')

#pygame.mixer.music.load('/home/yu/work/symphony/background.mid')

#pygame.mixer.music.play(-1, 0.0)



# run the game loop

while True:

    # check for the QUIT event

    for event in pygame.event.get():

        if event.type == QUIT:

            pygame.quit()

            sys.exit()

        if event.type == KEYDOWN:

            # change the keyboard variables

            if event.key == K_LEFT or event.key == ord('a'):

                pickUpSound.play()

regards
yu