ah, should have been more clear about this:

the cmos version of the 555 is a different chip altogether; it draws
a lot less power and doesn't soft sync to nearby 555s as badly. it
would probably work if you used the normal 555, but not as well. when
i started with normal 555s the pitches affected eachother (soft
sync). usually they are called 7555 or LMC555. radio shack carries
them, but often only like 3 at a time, luckily i live near 3 radio
shacks. the oscillator schematic is the standard one, i just made one
like this:

http://www.interq.or.jp/japan/se-inoue/e_ckt5_1.htm

except Ra=1k, Rb=100k pot, and C is like .1uF i
think. if you have a breadboard, it's probably a good idea to get an
oscillator circuit on there first and make sure it's working before
building them all onto a board and then having to wrench components
back out. if the oscillator doesn't go low enough for you, you can
attach more capacitors in parallel; putting two .1 uF in the same
spot will give you .2 uF i think.

hope you didn't waste a lot of $$ on the 555s. if it's any
consolation i have a bunch sitting around that i probably won't use
either since the cmos version is more useful.

--- In tr-707@yahoogroups.com , "bisaillon3" <bisaillon3@y...> wrote:
> I bought a bunch a 555 chip and now i try to find the schematic of
> cmos version... it is possible to draw me the schematic or send it
> in the file room. I got no news from roland for the m64-c cartridge
> and i still building my eprom burner for the 707. I keep u in touch
> with my progress.
>
> bizz
>
>
> --- In tr-707@yahoogroups.com , "foleymachine" <foleymachine@y...>
> wrote:
> > yes, each pin corresponds to one (or one pair) of the
instruments:
> > BD1/2, SD1/2, LT, MT, HT, RIM/COW, CP/TAMB, OH/CH. that is except
> for
> > the ride/crash, which has a different clock input that i
mentioned
> in
> > a later email. i don't know which pins are for which sounds, i
> just
> > hooked them up and then mounted the knobs after testing them.
> > basically what's going on is the samples are like 32khz or
> whatever,
> > and there is a corresponding fixed 32khz squarewave coming out of
> a
> > chip and connecting to all of the clock input pins. disconnecting
> > them gives you clock inputs into which you can send individual
> > variable-speed squarewave 555 oscillators, which act as
individual
> > variable-speed sample playback clocks.
> >
> > the pots i used are pretty small, they're like stompbox pots
> except
> > the shaft is a little longer. i mounted them all at the bottom of
> the
> > case, underneath the corresponding sound names. the board with
the
> > oscillators is just kind of crammed in between the pots and the
> two
> > main boards. i lined the 555s all up in a row to make the board
> > narrow and long.
> >
> > hot sounds: the snare is really bitchin tuned down, it's like
this
> > heavy tight smashing sound. tuned up it's nice and march-y
> sounding.
> > the tamborine is also really great low down, it sounds like this
> > faraway clanging down at the shipyard or something. of course
> > everything else sounds cool too. the sounds really lose
> > their "realism" (great!) when tuned either up or down, i think
> this
> > is because they are only eight bit, nice and chunky. also you
hear
> > the aliasing noise when you tune them down below the frequency of
> > their anti-aliasing filters.
> >
> > let me know if you have any other questions,
> > greg
> >
> >
> > --- In tr-707@yahoogroups.com , "djdsl_tru" <dsl_tru@h...> wrote:
> > > This sounds awesome.. i cant wait to try this mod out. Sounds
> like
> > > itll be the perfect complement to my heavily bent 626, hell,
> maybe
> > > it'll work on that box too, if ive got any room left in it that
> is.
> > > Your'e description is a little hard for me to follow though.
> Maybe
> > > when I have my 707 open, it'll all come together. Do each of
the
> > pins
> > > that you're disconnecting (56, 57, and 59-64 of ic30 )
> correspond
> > to
> > > one of the instruments
> > > Howd you mount all the pots too.. you mustve got some mini ones.
> > > Thanks, and its comforting to know theres a few other peoples
> out
> > > there breathing life into the somewhat dead sounds of rolands
> line.
> > >
> > >
> > > --- In tr-707@yahoogroups.com , "bisaillon3" <bisaillon3@y...>
> wrote:
> > > > > --- In benders@yahoogroups.com , "foleymachine"
> > <foleymachine@y...>
> > > > > wrote:
> > > > > > hi,
> > > > > >
> > > > > > in case anyone is interested, i added pitch knobs for
each
> of
> > > the
> > > > > > sounds in my 707.