Yamaha CS80

All oscillators on a CS-80 start out as an inverted sawtooth
waveform....then gets processed through a waveshaping chip where it is
split up and sent to different amplifiers including sine....there is a
picture of this process on the hatch of the preset
compartment.....inverted saw leaves pin 7 on IC8 and moves toWave Shape
Converter IC9 pins 9, 12 and13.....(10,11 pw control)....pin 2 Sine
out....pin 5 sawtooth out and pin7 is pulse/square out(I believe pin 3
is triangle out resent to12 and 14 to help shape square....)Noise is
generated off of the M board

Max Fazio wrote:

>   Tim !You did a great job by making these samples!I achieved similar
> results with a sample I grabbed
> fromhttp://personal.inet.fi/private/matador/cs-50_square.mp3(44.1KHz,
> 16bit) Look at the wave. Never seen such a strange square ( but is
> THIS a square ????). See below; anyway I would be extremely glad to
> work on your samples but my mailbox can't bear such attachments so I
> think it could be better if you can actually manage an FTP
> folder;-)Thx again!!!M
>
>      ----- Original Message -----
>      From: Tim Siefkes
>      To: yamahacs80@yahoogroups.com
>      Sent: Friday, December 02, 2005 4:25 AM
>      Subject: Re: [yamahacs80] Square wave
>       Okay.. to Max and ohesh (in Germany),
>
>      I have sampled the square wave output from my CS80 into a
>      pair of .WAV files, sampled at 192,000 khz 32-bit
>      resolution.
>
>      The first file is a ten-second recording of the lowest "C"
>      at the 16' setting, the lowest ordinary note you can play on
>      the CS.
>      The second file is about a five-second sample made after
>      sweeping the pitch down on the ribbon controller to where it
>      sounds like discrete clicks.
>      Filters were wide open, no modulation or outside effects
>      were used.
>
>      Looking at these in my waveform display they do not look
>      much like a square wave at all! I'm attaching a small
>      screenshot of the waveform I see. Hopefully it will come
>      through to the group. Do you want me to e-mail these files
>      to you directly? These .WAV files weigh in at 7.5 MB and 4.5
>      MB respectively. I also combined them into a Zip archive
>      which is about 8.8 MB for the two of them together. I don't
>      want to overwhelm anyone's mailbox with large attachments.
>      The other alternative is I could post them to an FTP
>      location where they could be grabbed at your own leisure.
>      Please let me know how I can best get these files to you.
>
>      -Tim S.
>      <Minneapolis>
>
>      Max Fazio wrote:
>
>     > Thank you so much ! Correctly my friend Laurie wrote me
>     > that the audio result of the pure wave could be heavily
>     > affected by the actual settings of the filters' trimmers
>     > into each M-board.I'm aware of it and I will do my
>     > experience having the final results on a statistical
>     > shape.I recently analysed the sine wave into the ring
>     > modulator and ended up with some correct datas ( or at
>     > least as less approximated as I could ).Well, the sine
>     > wave I can hear into the modulation wave ( and in the PWM
>     > , SubOsc and within Chorus LFOs) isn't a plain sine: it
>     > consists of a "wrong" sine wave with a single harmonic
>     > tuned 2oct upper and with 4% of the total amplitude, I was
>     > able to reproduce it digitally with a common FFT generator
>     > : this implies the fact that , within ringmodulation there
>     > is something like a "hidden" sine which modulates the
>     > signal togheter with the fundamental at two octaves
>     > upper....that's why its sound is SO rich!!Thx again for
>     > your help!Max
>     >
>     >
>     >
>      -------------------------------------------------------------
>
>                                [Image]
>
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