Doepfer

I've got a question about the Doepher A151 Sequential switch. Using the 
switch in the fashion of inputting 3 CV feeds in, and taking an output 
from the I/O socket, I'd need to input a reset signal into the reset 
socket to cancel the 4th switching on each pass. Does anyone know where 
I'd get the pulse from to do this ?  
I'm feeding in three CVs from three Analogue Sol sequencers into 1,2 
and 3, then taking the output from the I/O socket to my quantiser, and 
then on to the CV input of a VCO. The switching pulse for the A151 is 
coming from the 1:8 output of my master clock. The 1:1 output goes to 
the three sequencer's CLOCK inputs, (and also to the TRIG of an 
envelope generater), giving me the full 8 channels on a sequencer, 
which then switches to the next sequencer and so on, so we have in 
effect one 24 channel sequencer, but the resetting of the A151 is 
giving me a problem.
Can anyone help please ?