No, WaveNetVocalizer Agency is an Upgrade for WaveNetVocalizer Standard Montly or Yearly Subscription.
Once you Upgrade your Subscription to WaveNetVocalizer Agency you can use the Agency features inside your WaveNetVocalizer account as long as you keep renewing your WaveNetVocalizer standard Monthly or Yearly Subscription. You will not need to pay any additional fee for the Agency Features as long as your WaveNetVocalizer Monthly or Yearly Subscription is active.