Keep in mind that modular music is experimental and often improvisational, and so people tend to be more forgiving and not even notice or care much about mistakes.
In a live band with songs, when people forget their parts, it’s worse. If equipment malfunctions, it can ruin the set completely. Whereas with modular, you’re generally controlling a few parts and can afford to lose a couple voices. Not likely that your power supply or sequencer is going to give out mid-set, but old amps and guitar strings are unpredictable that way.
If you’re doing melodic music, invest in a tuner, and use sine or other simple waves to tune.