I was playing with the arpeggiator in Reason and the gate length. As you may know, turning the gate length all the way makes RPG-8 send tied notes to your synth which is nice for legato sounds. So I thought it would be nice to trigger tied notes occasionally to get legatos in lead and base lines. This would make it easy to play stuff like proper acid base lines live from the keyboard.
Right, gate length has a cv modulation on the back. This should only be the case of hooking up a curve matrix with a suitable pattern. Apparently this doesn't work. It looks like the cv input doesn't modulate the gate length knob directly and maxing out the gate length in this manner does only that :( and no tied notes.
After asking around on the Propheads forum I found a workaround. Sending the cv signal through the programmer section of a combinator :D The combinator appears to modify the knob directly as regular automation which triggers tied notes when it is maxed out.
So here it is:
First set up the RPG-8 as you like it and set up a unipolar curve matrix with a pattern. Note that you set the gate length directly in the pattern so you need a suitable "rest" length for untied notes. Put these units in a combinator along with your synth.

Hook up the curve cv out from the matrix to a cv input on the combinator and move the cv trimpot to max.

-a