if you look at the TR-72707 guts file i uploaded, you can see a
number of blue wires near the lower left hand side of the board. i
believe all of these are reconnecting the extra points that got
disconnected by cutting the clock traces. check the schematic just to
be sure, but if you experiment with connecting those points you
should find that the distortion and tonal changes go back to normal.
sorry for the blurry photo. the grey ribbon cable going under the
board is the clock signals. they come up to the pins through tiny
holes that you can't really see in this picture.

--- In tr-707@yahoogroups.com , "gregory zifcak" <foleymachine@y...>
wrote:

>
> hi, desoldering the pins sounds like an easier cleaner way to do

it!

> once you've cut the tracks underneath and in front, you will need

to

> reconnect certain points on the board that originally connected to
> each other through the input pins. finding these on the schematic

and

> reconnecting them will get rid of the distortion and unpredictable
> behavior. i was able to get all the sounds to behave normally when
> pitched to the original frequency. the pitch knobs now create no
> other effects. finding the points can take a while, but as you
> reconnect points you'll hear anomalies go away.
>
> my clocks bleed through at lower frequencies as well.
>
> i'll upload a sample soon.
>
> --- In tr-707@yahoogroups.com , "acousmatique" <acousmatique@y...>
> wrote:
> >
> > I finally did it, after months of having my 707 open in the

garage.

> I had made a
> > prototype 555 oscillator, which I tested by applying to the

various

> gate pins.
> > Last weekend I made a small circuit board of eight such

oscillators.

> >
> > This morning I put 100k sealed 1/8" pots along the front of the
> unit, just in front
> > of the drum buttons. I lifted all of the relevant gate IC pins

and

> severed the
> > traces under those. Severing the traces in front of the IC was
> easy. Soldering
> > the pins back onto their pads provided some mechanical support.
> > Unfortunately, pin 64 - handclap - had broken off of the Gate

Array

> since I'd
> > last tried this a couple of weeks ago. I used a razor to gently
> scrape away
> > enough of the plastic on the chip to reveal a tiny bit of metal

to

> solder to. I
> > connected the pots to the oscillator board, and ran outputs from

it

> to the Gate
> > Array IC. The outputs were a little tricky, but no so bad. I used
> wire-wrap wire,
> > which must be like 30-32 AWG. Very fine stuff.
> >
> > Having gotten all of the pins wired to their oscillators, the 707
> does not work
> > quite as I had expected. There is some high-frequency noise from
> the 555s,
> > but that doesn't bother me. My kicks and snares sound nowhere

near

> as good
> > as before I hard wired them. The toms are so loud now that they
> overwhelm
> > all of the other sounds. I put TWO clock signals to the kick or
> snare pins and
> > they sound great! I guess I will experiment with the resistor and
> cap values on
> > the oscillator board a little more. Somehow, the process of
> soldering the clock
> > outputs had caused the memory of the 707 to be filled with random
> drum
> > patterns! I spent a few hours exporing the new sounds with these
> ghost
> > patterns.
> >
> > Overall sounds great, though I am going to need to tweak the

setup

> a bit more
> > before I consider it ready.
> >
> > CJ