Like the dual vcf very ergonomic compact and functional. Neutral sounding, these days many vcas use the 2164 chip which is clean and powerful but in vca applications tend to overdrive harshly. So this one is an old fashoined design, always sounds good, 3 sig inputs with attenuation, 3 idem moulators, a big bias knob. Nothing much else to say, its all just very solid. The whole system100 range as far as I have used is very good sounding, consistent and surveyable, therefore to be used together.