Speaker Volume Adjustment

Hi there, so I have been hitting my head on walls about this topic for days. So, I am designing a device that has 2 speakers on it. And I need to adjust the volume. First I tried using the ToneAC library, and it worked. But I need those 2 speakers connected to separate pins so I can control each of them separately. And the tone ac works on mega on only the pins 9&10 which is a problem. I searched several modules but I am lost. A little help would be perfect.
PS: the volumes should be the same on each of them. but I need them to beep in a sequence, not at the same time.