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Voice board calibration

2014-11-07 by f115@rocketmail.com

Once I got my clone board working on the Polysix I discovered that nearly every trimpot on the KLM-366 has been adjusted in some way. I've made a reasonable amount of headway calibrating but I have a handful of questions. Clearly there's a real relationship between all these sections. I want to make sure I get it right. Perhaps I should have broken out my questions to different thread but maybe it's useful if it's contained here. I guess we'll see.

1) In section (3) VCF Resonance it asks that I adjust to obtain 0.000V. It's referring to Cutoff, right? That's what worked for me but I just want to rule it out. It looks like a simple omission of what VR needs the adjustment.

2) In section (4) VCF f0 Adjustment step 4) Cutoff to 10: I don't hear a thing on my unit here. It's fine and audible when set to 8.000V in the previous step but at 10 I don't get anything close to 300mV p-p. It makes me wonder if my earlier assumption about question 1) here is incorrect.

3) Section (7) Pitch Check and Adjustment is really inconsistent for me. For one the keyboard tracking and all voice tune trimpots were set to all sorts of extremes when I started here. Would it make sense to base tracking on a calibrated Voice 0 instead of following these steps in the documented order? Octave changes are way off and playing a scale is inconsistent because the VCOs are not calibrated in the first place. I've done a few passes and am getting closer. I just wonder if I should go about it another way.

4) Also in (7) Pitch Check and Adjustment it says to set it Octave to 4' and tune C6. Really? The note is extremely high, barely audible. I have scope to try to perhaps capture the frequency but a tuner doesn't handle that pitch well.

A lot to ask of all of you, I know. But hey, we can finally shift the discussion away from a 367 for a little while.

That's refreshing, right?

Re: [PolySix] Voice board calibration

2014-11-08 by Bob Grieb

Hi,
    For the pitch tuning, if the anti-log converter adjustmentshave been messed with, you would want to fix that up.
But I would check it first.  Maybe it wasn't changed.Unfortunately, since it's time-multiplexed its not as simpleto test as some other synths.  The anti-log will affect the 
tuning of all six voices, of course.
    1) For the VCF res adjustment, you set the Cutoff Front 
panel control to get 0V at the indicated point.
    2) In step 4, you test the oscillation freq as a fcn of the cutoffcontrol.  At the low end, it should be 10-25 Hz.  At the upper end,19-24KHz, which you won't be able to hear.   The P6's I have seenwere more like 28 KHz at the upper end.  I got 300 mV p-p.Are you still probing at TP-1?

    In step 4 of the pitch check and adjustment, instead of VR1you should use VR15.   I think VR1 would have been correct 
for the older units.  Actually, I haven't tried to use the Korgsteps to adjust the anti-log.  There is a separate document in the filessection on how to do that.  I think it's a little more usable than 
what Korg suggests, but that's just my opinion.

     Bob

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      From: "f115@rocketmail.com [PolySix]" <PolySix@yahoogroups.com>
 To: PolySix@yahoogroups.com 
 Sent: Friday, November 7, 2014 10:11 AM
 Subject: [PolySix] Voice board calibration
   
     Once I got my clone board working on the Polysix I discovered that nearly every trimpot on the KLM-366 has been adjusted in some way. I've made a reasonable amount of headway calibrating but I have a handful of  questions. Clearly there's a real relationship between all these sections. I want to make sure I get it right. Perhaps I should have broken out my questions to different thread but maybe it's useful if it's contained here. I guess we'll see.

1) In section (3) VCF Resonance it asks that I adjust to obtain 0.000V. It's referring to Cutoff, right? That's what worked for me but I just want to rule it out. It looks like a simple omission of what VR needs the adjustment.2) In section (4) VCF f0 Adjustment  step 4) Cutoff to 10: I don't hear a thing on my unit here. It's fine and audible when set to 8.000V in the previous step but at 10 I don't get anything close to 300mV p-p. It makes me wonder if my earlier assumption about question 1) here is incorrect.
3) Section (7) Pitch Check and Adjustment is really inconsistent for me. For one the keyboard tracking and all voice tune trimpots were set to all sorts of extremes when I started here. Would it make sense to base tracking on a calibrated Voice 0 instead of following these steps in the documented order? Octave changes are way off and playing a scale is inconsistent because the VCOs are not calibrated in the first place. I've done a few passes and am getting closer. I just wonder if I should go about it another way. 
4) Also in (7) Pitch Check and Adjustment it says to set it Octave to 4' and tune C6. Really? The note is extremely high, barely audible. I have scope to try to perhaps capture the frequency but a tuner doesn't handle that pitch well.

A lot to ask of all of you, I know. But hey, we can finally shift the discussion away from a 367 for a little while.
That's refreshing, right? 

:D



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Re: Voice board calibration

2014-11-23 by andrijapusic@yahoo.com

A couple of questions, regarding the instructions in TUNINGPROC.TXT. It is under Files, Mods&Repair folder:

- I have OLD version, no VR2, no VR15. How should I interpret instructions?

- In the step 14) there is a "trimmer". Which trimmer? (The same mystery is in the original Korg Repair Manual. There they are talking about "confirming"... not clear at all.)

- I am using another, very precise digital synth as my tuning reference. By listening to beats, I can be very accurate. This instruction requires precise voltmeter and voltage calculations. Is it not much simpler to use ear instead of voltmeter? Can anyone suggest tuning procedure by ear? Or at least by a good guitar tuner?

Thanx!

Re: [PolySix] Re: Voice board calibration

2014-11-24 by Bob Grieb

If you have KLM-396, VR1 on that board is equivalent to 
VR15 on the KLM-366 newer board.
If you don't have VR2, then you don't need to set it in the middleor adjust it.   The procedure for setting up the anti-log should be 
the same, I think.
Each voice has its own tuning low and high adjustment,but the anti-log is shared by all of the voices.   So I am not surehow you would set it by ear.   Sine it converts from a linear voltageto a logarithmic one, using a meter seems to me the easiest wayto adjust it.  Of course, the best course is to leave the anti-log aloneunless someone else has already messed with it.

But maybe someone else has a better way.
I do not.
    Bob Grieb

Show quoted textHide quoted text

      From: "andrijapusic@yahoo.com [PolySix]" <PolySix@yahoogroups.com>
 To: PolySix@yahoogroups.com 
 Sent: Sunday, November 23, 2014 3:58 PM
 Subject: [PolySix] Re: Voice board calibration
   
    A couple of questions, regarding the instructions in TUNINGPROC.TXT. It is under Files, Mods&Repair folder:
- I have OLD version, no VR2, no VR15. How should I interpret instructions? 

- In the step 14) there is a "trimmer". Which trimmer? (The same mystery is in the original Korg Repair Manual. There they are talking about "confirming"... not clear at all.)
- I am using another, very precise digital synth as my tuning reference. By listening to beats, I can be very accurate. This instruction requires precise voltmeter and voltage calculations. Is it not much simpler to use ear instead of voltmeter? Can anyone suggest tuning procedure by ear? Or at least by a good guitar tuner? 
Thanx!  #yiv1865932599 #yiv1865932599 -- #yiv1865932599ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv1865932599 #yiv1865932599ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv1865932599 #yiv1865932599ygrp-mkp #yiv1865932599hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv1865932599 #yiv1865932599ygrp-mkp #yiv1865932599ads {margin-bottom:10px;}#yiv1865932599 #yiv1865932599ygrp-mkp .yiv1865932599ad {padding:0 0;}#yiv1865932599 #yiv1865932599ygrp-mkp .yiv1865932599ad p {margin:0;}#yiv1865932599 #yiv1865932599ygrp-mkp .yiv1865932599ad a {color:#0000ff;text-decoration:none;}#yiv1865932599 #yiv1865932599ygrp-sponsor #yiv1865932599ygrp-lc {font-family:Arial;}#yiv1865932599 #yiv1865932599ygrp-sponsor #yiv1865932599ygrp-lc #yiv1865932599hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv1865932599 #yiv1865932599ygrp-sponsor #yiv1865932599ygrp-lc .yiv1865932599ad {margin-bottom:10px;padding:0 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Re: [PolySix] Re: Voice board calibration

2014-11-24 by Bob Grieb

In step 14, the trimmer would be VR14, which is associated with the DAC.The old KLM-366 does not seem to have this trimmer.
   Bob

Show quoted textHide quoted text

      From: "andrijapusic@yahoo.com [PolySix]" <PolySix@yahoogroups.com>
 To: PolySix@yahoogroups.com 
 Sent: Sunday, November 23, 2014 3:58 PM
 Subject: [PolySix] Re: Voice board calibration
   
    A couple of questions, regarding the instructions in TUNINGPROC.TXT. It is under Files, Mods&Repair folder:
- I have OLD version, no VR2, no VR15. How should I interpret instructions? 

- In the step 14) there is a "trimmer". Which trimmer? (The same mystery is in the original Korg Repair Manual. There they are talking about "confirming"... not clear at all.)
- I am using another, very precise digital synth as my tuning reference. By listening to beats, I can be very accurate. This instruction requires precise voltmeter and voltage calculations. Is it not much simpler to use ear instead of voltmeter? Can anyone suggest tuning procedure by ear? Or at least by a good guitar tuner? 
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Discussion about the Korg PolySix synthesizer

Voice board calibration

Voice board calibration

Re: [PolySix] Voice board calibration

Re: Voice board calibration

Re: [PolySix] Re: Voice board calibration

Re: [PolySix] Re: Voice board calibration

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