The Cyndustries List

That's encouraging news - thanks for yours and Mark's hard work on this!

Moe
http://www.stoogeindustries.com

--- In The_Cyndustries_List@yahoogroups.com, "John Loffink"
<jloffink@...> 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
>