How do I change the routing of the above switch using a modulation source other than a midi controller or morph - e.g. an lfo. Or do you have an alternative solution?

You'll have to get creative, the stock 4-1 switch doesn't have a modulation input. What I usually do is use the xfade or pan modules (you'll have to combine a bunch) since they are switches (albeit only two way) and they have modulation inputs.I haven't tested the attached patch (I'm at the office, sans modular), but this is the kind of thing I'm talking about. (you may need to offset the second lfo in order to get it to switch in and out opposite of the top one.)

I think this attached patch will do the trick. Turn knob 3 and see for yourself....

A way to do it is like in the patch. For a 4-pole switch there might be simpler ways, but I think this is one worth studying as it can be expanded to any number of poles and the switch tresholds can be set to pick or distribute a signal depending on specific non-regular ranges. The keyboard split module can also be used, but behaves slightly different as it samples and holds the inputs.

Hey Kees, do you think you can beat me by having an OFF position for a CV-controllable four-pole selector switch? Roland thinks we must be twins, doing the same thing at the same moment.

Thanks for that but what I should have stated was 'other than a midi controller or morph or knob e.g. an lfo or sequenecer output.

Kees' patch will do that if you plug an lfo in place of the constant module. The patch that I sent also does it. I'm fascinated by how people use logic modules. I understand what they do (I've been programming for > 15 years) but there's no way in a million years that I ever would have hit on the solution that Kees and Rob both came up with! Does anybody else have the weird mental block I have? Logic modules don't seem musical to me. I would never think "ah yes, I can set up a truth table to choose between different signal lines". To me, a panner or a crossfader chooses between things. Logics are just... illogical. :-)

I second this, I'm just as amazed as you are with the solutions people find with the logic modules. And I do feel the same mental block on using the logic modules..(and also programming for over all of life virtually) I'm using synths for some 23 years now, but since I am owner of a NM AND member of this list I'm learning more then all the years before :-)

Does anyone know what happens to the non-selected outputs of the 1-4switch. Do these outputs keep their latest value or are they reset to 0 when there not selected? Did anyone ever make a knob-layout ( i.e. in pdf- or doc-format ) that (after printing and some scissoring [is this correct English?] ) can be used to place over the NM control panel for adding explanatory text to the rotary knobs ?

They regrettably fall back to zero, so no S&H on the outputs. My guess is that the 1to4 switch was intended to distribute audio only, where this behaviour might be wanted. But when distributing modulation signals a S&H action on the outputs might be wanted instead, e.g. to hold notes. Here is an example patch that emulates a 1to4 modulation signal distributor with S&H, or better Follow/Hold action. Only one output follows the input, the other outputs hold the value they had when that output was switched to another output. As a bonus the switch is controllable by a modulation signal. Switching is controlled by the lfo in the left column, but connecting to the 4-1 switch under that lfo, you can control with the four buttons on that switch as well. You can see on the leds on the AD-Envs which output is following the input.