Hi everyone,
I want to thank everyone for responding to my question. You're all amazing and brilliant!! Trying the different options has taught me a lot and I know this post will be helping others as well.
In an earlier response, there was mention that the doubling effect may be coming from both the DAW and Presonus Audiobox. A friend of mine said it could be that I'm hearing both the direct signal and signal through sonar which adds latency, thus causing the "doubling effect." I had it set right in the middle. I'll adjust and see if that helps and if not, I may have to adjust the latency settings.
http://support.presonus.com/hc/en-us/articles/210044633-Why-am-I-getting-a-chorus-doubling-effect-when-I-monitor-through-my-DAW- The AudioBox has a feature that allows monitoring either directly through the inputs or from the computer. This is changed by manipulating the "Mixer" knob, shown below:

If the knob is turned to
inputs, one would only hear what is being played into the device; if the knob is turned to
playback, one would hear only what is coming from the computer. If the knob is set in an intermediary position, one would hear both.
Sometimes, if the knob is placed in an intermediary position, this can cause a "chorusing" or "flanging" effect, or even an effect as drastic as a slap-back delay. This is because it takes time for the audio to be processed by the computer, whereas the direct monitor bypasses the computer. Because of this delay, one of the signals is slightly (in the order of milliseconds) behind the direct input monitor, creating this "doubling" phenomena.
http://www.reverbnation.com/dlayna