Connecting multiple sources to Jamulus
If you want to connect many sources (e.g. voice + keyboard + bass), it is important to note that Jamulus currently handles only 2 input channels (either Mono 1 and 2 or Stereo L/R). So the hardware (audio interfaces or mixers) being used must provide a mixed-down 2 channels output to Jamulus.
Audio Interfaces generally output a mixed signal on their analogue output, but separate signals (1 per source) on their digital output (USB/FireWire/Thunderbolt).
Mixers generally only output mixed-down signals on their analogue output.
Mixers with USB/FireWire/Thunderbolt generally only output a mixed-down signal on their analogue and digital output.
A few Mixers with USB/FireWire/Thunderbolt (sometimes called “mixerface”) can send a stereo mixed-down signal AND/OR separate signals on the digital output.
Alternatively, you could run more instances of Jamulus, if your hardware/software supports it, or use a software mixer with virtual routing between your hardware and Jamulus (examples: Reaper with ReaRoute [Windows], UAD 8’s Console).