Soft saturation limits a too-hot signal more musically than hard clipping and leaves it recoverable downstream

When a module can boost a signal beyond the usable ±12 V Eurorack range (protection diodes actually cap it near ±11.7 V), how it limits the excess matters sonically. Hard clipping — flattening everything above a ceiling — produces harsh, square-edged digital distortion. Soft saturation — a smooth non-linear curve that progressively compresses the peaks — limits the signal more gently and musically, closer to the warm overload of analog gear. There is also a headroom argument: a signal that leaves a module merely too hot (rather than clipped) can still be attenuated by a later module and recovered, whereas hard clipping destroys that information permanently. So a stage with variable or greater-than-unity gain should prefer soft saturation, keeping the hard limit only as a final safety net at the audio output.

Examples

A wave-folder that can swing 20 Vpp should apply a smooth saturation curve (e.g. tanh) so its overload sounds warm; left un-saturated it would slam into the output stage’s hard ceiling and sound harsh and digital.

Assessment

Explain why soft saturation is preferable to hard clipping for a stage that can apply more than unity gain, addressing both the sound of the distortion and the ability to recover level later in the signal chain.