I am excited to hear that Daren Ager is developing a vintage synth patch collection for the A4. It sounds to me like you would be better off with sample banks though, if you want the exact character of old synths.

My solution to have some classic-sounding synths mixed in with the A4’s sharpness is to hook up a couple of inexpensive Korg Monotribes to it. They have almost identical filter achitecture as the Korg MS 20, which was a staple of the early Depeche Mode sound.

I often think about the paradox of trying to replicate the sound of early electropop/techno etc. Everything about it was progressive and futuristic, so the closer we get to emulating the sound, the further away we get from capturing the spirit.