This is all there is to connecting the mixer out to the ULTIMATE MIX OUT jack. It is simply the output of the ULTIMATE's signal mixer connected to a 1/4" jack with a 2K resistor in series. The 2K resistor is actually optional but it keeps the ULTIMATE's mixer from going quiet while you connect a cable between the ULTIMATE and the ULTIMATE EXPANDER as the cable's tip touches the EXPANDER's "FROM ULTIMATE MIXER OUT" jack sleeve. I recommend using a 1/2 watt resistor for the greater mechanical strength it provides.

Twist the pair before you connect it to the board. I usually take about twice the length of wire needed and twist one end of the two together a bit. Then I chuck the twisted end into a variable speed drill and grasp the wire between my thumb and forefinger near the chuck and as I slowly rotate the drill I slide my fingers toward the ends opposite the chuck. Don't try to twist the wire to full torsion all at once but do it in stages. Repeatedly grasping the wire near the chuck and sliding toward the ends opposite the chuck. Each time allow the wire to twist more tightly. Don't go too far or you could cause the wires to short as the insulation becomes too compressed. Untwist the ends a bit for connection to the board and the jack.

You will connect the hot lead (the one that will go to the 2K resistor and on to the jack tip terminal) to the side of R131 that connects to the output of U13 pin 6. If you have to remove and re-install a new R131 to get enough lead to get the hot lead around R131's lead for a good connection and solder joint it may be a good idea to do so. If you have enough lead already great.

You will connect the ground lead (the one that will go to the jack's sleeve) to the side of C40 that connects to ground. If you have to remove and re-install a new C40 to get enough lead to get the ground wire around C40's lead for a good connection and solder joint it may be a good idea to do so. If you have enough lead already great.

I connected my wires to the component side of the board (as shown in the diagram). You can also connect them to the bottom of the board at the pads that correspond to the circuit points shown in the diagram.

Finally here is a shot of the ULTIMATE's MIX OUT connected to the EXPANDER's "FROM ULTIMATE MIXER OUT" jack. The EXPANDER buffers the ULTIMATE's MIX OUT and provides two banana jacks on it's main panel for patching the ULTIMATE's MIX OUT signal into the EXPANDER's modules.

Sound Lab ULTIMATE Patch Points

This is all there is to adding inputs to the ULTIMATE's mixer and/or adding mixer out point(s) to the panel. The schematic and corresponding PCB circuit points are shown below.

Keep the lead from the inverting input to the added input mixer resistors as short as possible. Add a small daughter board (Vero or equivalent) near the mixer to support the added resistors.

This is all there is to adding extra inputs to the ULTIMATE's VCF, adding extra CV inputs to the VCF and/or adding VCF out point(s) to the panel. The schematic and corresponding PCB circuit points are shown below.

This is all there is to adding extra inputs to the ULTIMATE's VCA, adding extra CV inputs to the VCA and/or adding VCA out point(s) to the panel. The schematic and corresponding PCB circuit points are shown below. As explained in the schematic below isolating the VCA input from the normallized path from the output of the VCF is accomplished by removing C56.