200e

the scaling of cv for pitch is user-variable and bidirectional....
1.2v/oct (yes exactly) is the maximum.

On Sat, Jan 17, 2009 at 1:32 PM, John Loffink <jloffink@austin.rr.com> wrote:
> Jon,
>
> I appreciate any help you can render.
>
> How accurate is your DMM for reading voltages? The best test would be
> to confirm the outputs at the stated voltages, then take them to two
> 259e/261es that are tuned exactly the same. If you here no beating
> between the VCOs when controlled from the 222e and separated by two or
> three octaves, then the 1.200 volt octaves would be confirmed. If you
> hear a little beating, it might be due to DAC resolution from the 222e.
> If you hear a lot of beating then it is likely something other than
> 1.200 volts exactly.
>
> John Loffink
> The Microtonal Synthesis Web Site
> http://www.microtonal-synthesis.com
> The Wavemakers Synthesizer Web Site
> http://www.wavemakers-synth.com
>
> jon schatz wrote:
>> On Jan 17, 2009, at 10:43 AM, John Loffink wrote:
>>
>>
>>> Can someone confirm for me that Buchla 200e tuning is _exactly_ 1.200
>>> volts per octave?
>>>
>>
>>
>> i assume you're talking about the 259e and 261e? the 260e has a weird
>> scale that's something like (i think) 6v/octave; i have a preset saved
>> for that and i can verify later today.
>>
>> the 222e lets you specify a voltage in hundredths of a volt. and if i
>> were to tune it to something like
>>
>> 0 0.20 0.40 0.50 0.70 0.90. 1.10 1.20
>>
>> and patch it into a 259e/261e with the cv input turned all the way to
>> the right (and no pitch modulation) this would come out sounding like
>> a major scale. and
>>
>> 2.40, 3.60, 4.80, 6.00, etc
>>
>> are octaves above.
>>
>> so i can't verify that it's exactly 1.200, but i can say it sounds
>> close to 1.20. i can take readings voltage if you'd like more
>> preciseness? i don't have a scope right now so i can't definitively
>> say that an increase of 1.20 volts is exactly one octave.
>>
>> also, i could take readings from the 225e if you're curious about the
>> voltage that outputs.
>>
>> thanks,
>>
>> -jon
>>
>>
>