The Cyndustries List

OK, I tried the Indexed Linear FM with and without Varisync from the MOTM
300 triangle wave. Without Varisync I definitely hear the mistracking of the
ZO compared to the MOTM as clangorous inharmonics as I play up the keyboard.
With Varisync connected, set to soft sync at 1.5, the sound does not exhibit
the clangorous tones, and modulates normally.  Since you require another VCO
anyway for the Linear FM, it is a simple matter to plug the sine wave into
Linear FM and triangle into the Varisync.  This will provide the best
results, using the same VCO master for both.  So this appears to be a valid
and simple workaround.

A second ZO is not recommended as the master VCO.  You cannot really use a
MOTM 310 either since the output is a sawtooth to square mix.  You'll
normally want a sine wave for the Linear FM input.

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 John Loffink
> Sent: Tuesday, February 28, 2006 7:33 AM
> To: The_Cyndustries_List@yahoogroups.com
> Subject: RE: [The_Cyndustries_List] ZO 1V/Octave calibration
> 
> ZO results using the Varisync function.  MOTM VCO triangle to ZO Varisync
> input.  Varisync set to 1, soft sync.
> 
> Range switch: Lowest setting
> Bias switch:  High
> Tuning Knob in middle of range
> 
> Desired Voltage	Input Voltage	Desired Frequency	Actual
Frequency
> Error (Hertz)	Error (percent)
> -1	-1.0007	15	15.039	0.039		0.26%
> 0	-0.0034	30	30.25		0.250		0.83%
> 1	0.9940	60	60.17		0.170		0.28%
> 2	1.9915	120	119.99	-0.010	-0.01%
> 3	2.9887	240	240.09	0.090		0.04%
> 4	3.9862	480	480.2		0.200		0.04%
> 5	4.9837	960	959.87	-0.130	-0.01%
> 6	5.9820	1,920	1916.7	-3.300	-0.17%
> 
> Results are much better, as the ZO tracks the MOTM VCO frequency.  I have
> not checked the audible difference between modulating this ZO
> configuration
> and the one without soft sync.  These measurements are with an unmodulated
> ZO.
> 
> 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 John Loffink
> > Sent: Monday, February 27, 2006 11:22 PM
> > To: The_Cyndustries_List@yahoogroups.com
> > Subject: RE: [The_Cyndustries_List] ZO 1V/Octave calibration
> >
> > My results.
> >
> > I used the preferred ZO setting for accuracy per the manual. I did not
> > adjust the ZO 1V/oct tracking trimmer.  It is at the factory setting.
> >
> > Range switch: Lowest setting
> > Bias switch:  High
> > Tuning Knob in middle of range
> >
> > Encore Expressionist used as the voltage source.  Both VCOs patched to
> > 1V/oct jacks.  Measured frequency on sine out.  No other cables plugged
> > in,
> > all modulation controls at minimum.  Both VCOs in the same cabinet
> running
> > from the same power supply.
> >
> > I set the VCO tuning as accurately as I could to 120 Hz at the 2 volt
> > input.
> > This is the reference frequency.
> >
> > MOTM VCO calibrated by me recently.
> >
> > Measurements with Extech Multimaster 560 5/6 digit DMM.  Voltage
> accuracy
> > is
> > rated at +/- 0.03%.  Frequency accuracy is rated at +/- 0.008%.
> >
> > ZO data
> >
> > Desired Voltage	Input Voltage	Desired Frequency	Actual
> Frequency
> > Error (Hertz)	Error (percent)
> > -1	-1.0007	15	14.812	-0.188	-1.25%
> > 0	-0.0034	30	30.16		0.160		0.53%
> > 1	0.9940	60	60.308	0.308		0.51%
> > 2	1.9915	120	119.99	-0.010	-0.01%
> > 3	2.9887	240	238.16	-1.840	-0.77%
> > 4	3.9862	480	472.2		-7.800	-1.63%
> > 5	4.9837	960	934.25	-25.750	-2.68%
> > 6	5.9820	1,920	1841.7	-78.300	-4.08%
> >
> > MOTM-300 data
> >
> > Desired Voltage	Input Voltage	Desired Frequency	Actual
> Frequency
> > Error (Hertz)	Error (percent)
> > -1	-1.0007	15	14.965	-0.035	-0.23%
> > 0	-0.0034	30	29.958	-0.042	-0.14%
> > 1	0.9940	60	59.954	-0.046	-0.08%
> > 2	1.9915	120	119.96	-0.040	-0.03%
> > 3	2.9887	240	239.89	-0.110	-0.05%
> > 4	3.9862	480	479.68	-0.320	-0.07%
> > 5	4.9837	960	958.23	-1.770	-0.18%
> > 6	5.9820	1,920	1912.1	-7.900	-0.41%
> >
> > For comparison, Synthesizers.com VCO data from their web site, not
> > measured
> > by me, uses 128 Hz as based frequency.
> >
> > Desired Frequency	Actual Frequency	Error Hertz	Error
> > Percent
> > 32		32.07		-0.07		-0.22%
> > 64		64.16		-0.16		-0.25%
> > 128		128.2		-0.20		-0.16%
> > 256		256.2		-0.20		-0.08%
> > 512		511.9		0.10		0.02%
> > 1,024		1023.2	0.80		0.08%
> > 2,048		2046		2.00		0.10%
> > 4,096		4094		2.00		0.05%
> > 8,192		8236		-44.00	-0.54%
> > 16,384	16778		-394.00	-2.40%
> >
> > I hope the ASCII tables don't become too jarbled.
> >
> > John Loffink
> > The Microtonal Synthesis Web Site
> > http://www.microtonal-synthesis.com
> > The Wavemakers Synthesizer Web Site
> > http://www.wavemakers-synth.com
> >
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
>