Doepfer

I am not inside Doepfer, but in general, the A-154 is a basis to connect 
> to several simple sequencer like modules. The electronic "effort" is
not 
> to high. But the costs might be determined by the amount of mechanical 
> parts (potentiometers and switches), which are required. These are more 
> expensive than electronic parts, like integrated circuits,
resistors, etc.
> 
> Florian

I think Florian is right...16*4= 64 potentiometers cost quite some cash.
I haven't seen the inside of the 154, but i PRESUME it has a 4 bit
counter inside for the adressing ..so basically you would connect 16*4
pots to 4 16<->1 analog switch-ICs that you can control with these 4
bits...but in reality it will most likely be a whole lot more
electronics than just these switches and pots

d