The Cyndustries List

Richard,

That's the hard way to tune it.  You might try a 3 volt shift to the 1V/oct
input.  Set ZO to 240 Hz.  Tune the 3 volt shift to nearly 1920, but not
quite.  The two missing octaves in between will tend to fall into place.

The bass tuning is far less important, in my opinion.  Better to prioritize
the high end.

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com


> -----Original Message-----
> From: The_Cyndustries_List@yahoogroups.com
> [mailto:The_Cyndustries_List@yahoogroups.com] On Behalf Of Richard
> Brewster
> Sent: Tuesday, February 28, 2006 9:57 PM
> To: The_Cyndustries_List@yahoogroups.com
> Subject: Re: [The_Cyndustries_List] Recalibrated ZO results
> 
> Thanks for reporting this, John.  I will go through the calibration
> process again, although I am not sure it will help because I saw too
> much sensitivity on the low end (greater than one octave per volt) and
> not enough on the high end.   I would expect the trimpot only to shift
> the center of the accurate tracking range.  But my procedure was
> different from yours in that I used the Tuning knob to set the initial
> frequency and then applied one volt to the 1V/Oct input.  Then I would
> adjust the Tuning pot up an octave and repeat.  I will instead try
> increasing the CV input one volt at a time while leaving the Tuning
> alone and see if that has different results.
> 
> -Richard Brewster
> http://www.pugix.com
> 
> John Loffink wrote:
> 
> >OK, I pulled out my ZO and recalibrated to get the following much much
> >better results.  I would say there is a five octave range that is very
> good
> >by analog VCO standards.  I estimate the scale trimmer per the factory
> >settings was off by 1.5 to 2 revolutions.
> >
> >After final recalibration. ZO High Bias, Medium Range, Tuning in mid
> range,
> >base at 239.97
> >Desired Voltage	Input Voltage	Desired Frequency	Actual
Frequency
> >Error (Hertz)	Error (percent)	Desired Cents	Actual Cents
> 	Difference
> >Cents
> >-1	-1.0006	15	14.641	-0.359	-2.39%	-3398.25	-
> 3440.19
> >-41.94
> >0	-0.0033	30	29.638	-0.362	-1.21%	-2198.25	-
> 2219.27
> >-21.02
> >1	0.9941	60	59.627	-0.373	-0.62%	-998.25	-
> 1009.05
> >-10.80
> >2	1.9916	120	119.710	-0.29	-0.24%	201.75	197.56
> 	-4.19
> >3	2.9888	240	239.970	-0.03	-0.01%	1401.75	1401.53
> 	-0.22
> >4	3.9863	480	480.530	0.53	0.11%	2601.75	2603.66
> 	1.91
> >5	4.9837	960	960.140	0.14	0.01%	3801.75	3802.00
> 	0.25
> >6	5.9820	1920	1911.000	-9	-0.47%	5001.75	4993.61
> >-8.13
> >
> >Compared to my MOTM results from yesterday:
> >
> >MOTM VCO
> >Desired Voltage	Input Voltage	Desired Frequency	Actual
Frequency
> >Error (Hertz)	Error (percent)	Desired Cents	Actual Cents
> 	Difference
> >Cents
> >-1	-1.0007	15	14.965	-0.035	-0.23%	-3398.25	-
> 3402.30
> >-4.04
> >0	-0.0034	30	29.958	-0.042	-0.14%	-2198.25	-
> 2200.68
> >-2.43
> >1	0.9940	60	59.954	-0.046	-0.08%	-998.25	-
> 999.58	-1.33
> >2	1.9915	120	119.96	-0.040	-0.03%	201.75
> 	201.17	-0.58
> >3	2.9887	240	239.89	-0.110	-0.05%	1401.75
> 	1400.95	-0.79
> >4	3.9862	480	479.68	-0.320	-0.07%	2601.75
> 	2600.59	-1.15
> >5	4.9837	960	958.23	-1.770	-0.18%	3801.75
> 	3798.55	-3.19
> >6	5.9820	1,920	1912.1	-7.900	-0.41%	5001.75
> 	4994.61	-7.14
> >
> >I can get slightly better results for the ZO in the bass registers, to -
> 5.98
> >cents at 60 Hertz.  But that occurs at the expense of the higher
> registers,
> >and it is the higher registers that are more sensitive to tuning errors.
> I
> >doubt that tuning at 15 or 30 Hertz is relevant.  The ZO is now
> calibrated
> >to track the MOTM to within about 3 cents over a five octave range.  You
> >can't expect much better than that.
> >
> >The error (Hertz) difference shows what would be the beat frequency.
> This
> >is what might cause beats and clangorous tones.  Worst case beat
> frequency
> >is about 2 Hertz, which shouldn't cause the artifacts with indexed FM
> that I
> >described in previous posts.  Mark is working with me offline to
> understand
> >other causes for this.
> >
> >John Loffink
> >The Microtonal Synthesis Web Site
> >http://www.microtonal-synthesis.com
> >The Wavemakers Synthesizer Web Site
> >http://www.wavemakers-synth.com
> >
> >
> >
> 
> 
> 
> 
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