Vortex Sound Research

Hi guys - quick setup question

I have a TR8 drum machine that has been great! I send the audio through USB to Logic Pro. I also have a keyboard that I use to control software instruments within Logic Pro - I use a midi to USB cable to do that.

My problem: I have to constantly switch the TR8 USB and the Keyboard USB depending on what I am working with (I only have one USB port). I would like to have both plugged in simultaneously so that I can avoid this hassle of switching them. I also bought a cheap two USB dongle but it seemed to only choose one of the USB ports in Logic. What are some solutions that I could try?

Thanks a ton