Will my MoBo (MSI 970A-G43 Plus) allow me to use a sound card?

Your board has the following expansion slots... https://www.msi.com/Motherboard/970A-G43-PLUS/Specification

Slots

• 2 x PCIe 2.0 x16 slots (support x16/ x4 mode)
• 2 x PCIe 2.0 x1 slots
• 2 x PCI slots


Assuming you have a gpu running on one of the PCIe slots, you have 3 other PCIe slots and two PCI slots to run the sound card. If your sound card is PCIe, it will go into one of the PCIe slots.
 
Solution