How will I call a function two times?

Question

I want to make the sound ( hupen ) and (martinshorn ). Hupen every 2000 and martinshon every 4000. It doesn't work. I only get hupen every 2000.

class Geraeusche(pygame.sprite.Sprite):       
        def __init__(self):
            pygame.sprite.Sprite.__init__(self) 
            self.startzeit = 0 
            self.zaehler = 0    
            self.martinshorn = pygame.mixer.Sound("Bilder/martinshorn.mp3")
            self.hupen = pygame.mixer.Sound("Bilder/horn.wav") 
        
        def mach_geraeusche(self,warten,auswahl):
        
            if self.zaehler < 10:
    
                aktuelle_zeit = pygame.time.get_ticks()
                    
                if aktuelle_zeit - self.startzeit > warten:
                    self.startzeit = aktuelle_zeit
                    self.zaehler +=1
                    zz = getattr(self, auswahl)
                  
                    pygame.mixer.Sound.play(zz)              
   
    while True:
        clock.tick(60)   
        geraeusche.mach_geraeusche(2000,"hupen")
        geraeusche.mach_geraeusche(4000,"martinshorn")