MOTM

Last night I had a blast with the following patch.
Run a guitar through a preamp or compressor and
run the output into the CV IN of a 700. The signal
doesn't have to be up to MOTM levels, line level
is enough to switch the comparator. Set the
switch to voltage. Take the + and - outputs of
an 800 (well, any +/- source) and plug them
into IO A and IO B. Now when you play you get
a square wave.

But wait, there's more.

Take the output of the 700 and run it into the
Sync IO on a 300. Set it to hard sync. Do your 
best Pete Townsend imitation and hit a low E, 
then grab the coarse pitch knob. Changing the
pitch of the VCO causes these wild filter
like sweeps of the guitar-turned-square wave.

But wait, there's more.

Take the triangle out of an LFO and run it to 
an FM1 input with the switch set to EXP. Run
the saw output through a delay of about 800 ms. 
Hit a  note and let it sustain. When it dies out
the guitar-turned-square-induced VCO will
kick back to a pure tone, sweeping up and down 
like a siren.

Now play for hours or until the police show up.

I also tried to do an envelope follower using
only MOTM modules, but with not much success.
By putting the guitar signal into both inputs
of the ring mod, you get a full wave rectified
guitar signal at the output. I then tried to
filter this with a low pass, to get rid of the 
ripple. Unfortunately, if you get rid of the 
ripple you get a delay on the attack. I thought
about adding a negative offset to the output
of the ring mod and then sending this to another
rind mod to do double rectification of the guitar
signal (from a circuit idea in Electronotes),
but I didn't have a way to sum a negative voltage
with this output. 

I need a CV mixer. 

And more patch cables.

Tomy

Being EE illiterate, why do you put the guitar into a compressor or 
pre-amp first?  What is a compressor?   Can you put the guitar 
directly into the 700?

I know all this has to do with voltage levels (I think).  Is the 
output of a guitar too small or too large to go directly into the 
700?  Your patch sounds like fun, waiting to try it when my 700 gets 
built (soon), and I learn how to input my guitar into the synth.

Thanks
Andy

--- In motm@egroups.com, Thomas Hudson <thudson@t...> wrote:

> 
> Last night I had a blast with the following patch.
> Run a guitar through a preamp or compressor and
> run the output into the CV IN of a 700. The signal
> doesn't have to be up to MOTM levels, line level
> is enough to switch the comparator. 
> 
> .....................
>
> Tomy