This is the default single PC setup for Alias Pro in Sonar for Streamers:
PERSONAL MIX SteelSeries Alias Pro Personal (SteelSeries Alias Pro 1)
STREAM MIX SteelSeries Sonar - Stream (SteelSeries Sonar Virtual Audio Device)
MIC INPUT SteelSeries Alias Pro Input (SteelSeries Alias Pro 1)