I have installed two different sound cards. Can they be used by DJS? Or is a 2-output sound card required?

While DJS can use them, a 2-system or better multi-output sound card is a better choice. The reason for this is that the sound delay between outputs is the same. With multi-output sound cards this issue can be ignored. When different types of sound cards are used, use Preferences to set the same sound delay for both cards.

Also, since DJS's audio output sampling rate is 48 kHz, sound cards or devices not supporting 48 kHz will not be displayed on the spaces for sound card 1-2, and therefore cannot be used. Be sure to use sound cards and devices that support 48 kHz.