I just picked up an A-151 because of Milton, a 16 x 4 voltage
controlled sequencer I'm designing so I can construct these
humungus 32, 48 and even 64 step sequences. Kewl.

Not thinking about it clearly enough when I bought it, I figured I
would just use the NEXT step of the A-151 to reset it to anything
shorter than it's maximum range, much like you would with a
pulse sequencer.

Once I got it however, I realized how stupid this was. In a pulse
sequencer, you have pulses coming out of each of the outputs.
With this baby however, you have only whatever is on the I/0 port
coming out, and unless you've arranged it to be high like a pulse
at that specific moment, it don't reset.

Blast.

But it does have LEDs.....ahhhhhh ...and they take a high signal
from the mutliplexer to turn on...ahhhhhh....so I did the obvious
and it works like a charm.

There is 1 empty space below the last I/O jack which will (barely)
accept a hole and a switch to be installed. On the wiper, I have a
diode leading into the backside of the reset jack, to each of the
other contacts of this ON-OFF-ON three position switch I have
1Ks which connect to the step 3 and step 4 mutliplexer outputs.
You switch it up, and a two position sequence is selected. You
switch in downward, and a three step sequence is set. In the
middle, you have an open through the switch and the resets are
bypassed so it counts threw to four.

Because there's diode protecting this, the external reset jack can
still be used whenever you wish.

Sorry for the long post. I thought some of you might benefit from
this.

I have a schematic posted for this on my site. Go to:

http://www.allegrobikes.com/synth.html

and click on 'Son of Frankensynth" scroll to you see the link on
the word modifications, and when the new page loads, scroll
down to Doepfer A-151.

enjoy (or not),

Peter