In the words of JHS Pedals:

The Kilt V2 still has the fantastic circuit at the heart of the
version one: a heavily tweaked Expandora style dirt box that gives you
more tonal options than you might ever be able to use. We use a
specifically chosen op-amplifier that offers super low noise, improved
slew rate for a smoother structure, and a character that just feels
better than the original Expandora.