Doepfer A-138f Dual Three-Way Crossfader analogue you can use the ZOIA

you can use the ZOIA to build them out of all-pass filters)

The frequency range of the internal quadrature VCO is about 8 octaves (about 20Hz

4 User assignable inputs

Classic Tone

Doepfer A-138f Dual Three-Way Crossfader analogue you can use the ZOIAModule A 138f contains two identical crossfaders with three inputs and one output each. Three different signals are connected to the inputs A, B and C. In the ccw position of the corresponding control only signal A appears at the output. Between ccw and center position a mix of the signals A and B appears at the output. In the center position only signal B appears at the output. Between center and cw position a mix of signals B and C appears at the