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2009-01-17 by John Loffink
Can someone confirm for me that Buchla 200e tuning is _exactly_ 1.200 volts per octave? -- John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site http://www.wavemakers-synth.com
2009-01-17 by jon schatz
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 "There are no differences but differences of degree between different degrees of difference and no difference." - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; Vol 7.
2009-01-17 by jon schatz
On Jan 17, 2009, at 11:19 AM, jon schatz wrote: > 0 0.20 0.40 0.50 0.70 0.90. 1.10 1.20 ps - can i say how much 1.2v/oct tuning rules? i didn't get it until the 222e. thanks, -jon "There are no differences but differences of degree between different degrees of difference and no difference." - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; Vol 7.
2009-01-17 by John Loffink
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 > >
2009-01-19 by ezra buchla
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 >> >> >
2009-01-19 by jon schatz
On Jan 19, 2009, at 12:34 PM, ezra buchla wrote: > the scaling of cv for pitch is user-variable and bidirectional.... > 1.2v/oct (yes exactly) is the maximum. on my 259e i found this to be exactly the case. my 261e wasn't quite tracking accurately; is the calibration procedure documented somewhere? i assume this involves the small inset screw to the right of the main osc knob? thanks, -jon "There are no differences but differences of degree between different degrees of difference and no difference." - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; Vol 7.
2009-01-19 by ezra buchla
the little trim is for fine tuning pitch, shouldn't affect the scaling of incoming cv. On Mon, Jan 19, 2009 at 1:44 PM, jon schatz <jon@divisionbyzero.com> wrote: > > On Jan 19, 2009, at 12:34 PM, ezra buchla wrote: > > > the scaling of cv for pitch is user-variable and bidirectional.... > > 1.2v/oct (yes exactly) is the maximum. > > on my 259e i found this to be exactly the case. my 261e wasn't quite > tracking accurately; is the calibration procedure documented > somewhere? i assume this involves the small inset screw to the right > of the main osc knob? > > thanks, > > -jon > > "There are no differences but differences of degree between different > degrees > of difference and no difference." > - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; > Vol 7. > > > [Non-text portions of this message have been removed]
2009-01-19 by jon schatz
On Jan 19, 2009, at 2:05 PM, ezra buchla wrote: > the little trim is for fine tuning pitch, shouldn't affect the > scaling of > incoming cv. hey ezra, i actually mean the inset one on the bottom, not the fine tune on the top (or is the inset screw also fine-tune?). thanks, -jon "There are no differences but differences of degree between different degrees of difference and no difference." - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; Vol 7.
2009-01-19 by ezra buchla
gahh, y could be right. it has been a long weekend and my head hurts. i'm not sure if that little guy is actually implemented, it looks like not but i will check more when i get home to the DMM and the module itself. On Mon, Jan 19, 2009 at 2:10 PM, jon schatz <jon@divisionbyzero.com> wrote: > > On Jan 19, 2009, at 2:05 PM, ezra buchla wrote: > > > the little trim is for fine tuning pitch, shouldn't affect the > > scaling of > > incoming cv. > > hey ezra, > > i actually mean the inset one on the bottom, not the fine tune on the > top (or is the inset screw also fine-tune?). > > thanks, > > -jon > > "There are no differences but differences of degree between different > degrees > of difference and no difference." > - James, William. "Subjective Effects of Nitrous Oxide." Mind. 1882; > Vol 7. > > > [Non-text portions of this message have been removed]
2009-01-20 by John Loffink
Thanks Ezra. John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site http://www.wavemakers-synth.com ezra buchla wrote:
> the scaling of cv for pitch is user-variable and bidirectional.... > 1.2v/oct (yes exactly) is the maximum. > >
2009-01-20 by ezra buchla
oh, "maximum sensitivity" i should say, so no you can't dial it up to 1v/oct... On Mon, Jan 19, 2009 at 4:02 PM, John Loffink <jloffink@austin.rr.com>wrote: > Thanks Ezra. > > > John Loffink > The Microtonal Synthesis Web Site > http://www.microtonal-synthesis.com > The Wavemakers Synthesizer Web Site > http://www.wavemakers-synth.com > > ezra buchla wrote: > > the scaling of cv for pitch is user-variable and bidirectional.... > > 1.2v/oct (yes exactly) is the maximum. > > > > > > > [Non-text portions of this message have been removed]