I could be heard over the music, but only because I was singing in a room, not a crowded bar.
Singing very close to the microphone got a stronger pickup, but that also led to some distortions in the sound.
For those looking for better sound performance overall, it's possible to use another microphone with the Soulo app, though I did not test such a setup.
Another option may be a microphone with enhanced audio that Soulo's manufacturer is due to release later in the year.
Soulo works as a novelty add-on for the iPad. That may be good enough for casual wannabe-singers, but anyone looking for more than the occasional karaoke amusement may be disappointed.
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