If it’s not distinct which jack goes with which cord, consult your hardware manufacturer, or try the obvious outputs separately and find out whenever they perform. Quite a few keyboards have mute and volume buttons. Often these keys are literally shared keyboard keys. One example is, the arrow keys ←+→+↑+↓ https://www.youtube.com/channel/UCP9Gw00CldPUmiu43y7fdWw