.audio-bars .bar {
  animation: none;
}

.ag-audio-player.is-playing .audio-bars .bar {
  animation: equalize 0.8s infinite ease-in-out;
}

.ag-audio-player.is-playing .audio-bars .bar:nth-child(1) { animation-delay: 0s; }
.ag-audio-player.is-playing .audio-bars .bar:nth-child(2) { animation-delay: .15s; }
.ag-audio-player.is-playing .audio-bars .bar:nth-child(3) { animation-delay: .3s; }

@keyframes equalize {
  0%   { transform: scaleY(0.4); }
  50%  { transform: scaleY(1.4); }
  100% { transform: scaleY(0.4); }
}