Yamaha CS80

Speaking of that ....Does any one have a photo of the hatch picture....I
lost my lid a while back......

laurie wrote:

> 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]
>>