> Ahhh, thanks very much for the help. Can the A-143-9 morph between,
> say, 1->3

If want to pan between two sources only I'd recommend the panning module
A-134 and use e.g. a normal LFO (triangle output) as CV source.

If you want to pan between two sources with the A-135 that possible to: for
this purpose you have to control two of the VCAs with opposite control
voltages. A voltage inverter A-175 can be used to invert the main control
voltage (e.g. the triangle output of an LFO) for the second CV input. In
this case no A-144 is necessary. But if you have an A-144 available it can
be used for this job as well. You have to attenuate the control voltage that
is used to control the A-144 (e.g. the triangle output of an LFO) so that
only two of the A-144 outputs become active.

Best wishes
Dieter Doepfer