200e

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
>
>