vx351 pitch cv out to slim phatty pitch in tuning issues

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seank
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vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Sun May 22, 2011 1:17 pm

for some reason, when i have my slim phatty pitch cv patched to the vx351 pitch, the tuning is way off. the voltages are supposed to be compatible, right? i mean, i shouldn't have to attenuate the pitch out from the vx351, correct?

Sir Nose
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by Sir Nose » Sun May 22, 2011 6:06 pm

I know the little phatty pitch cv in is something like .97 volts per octave instead of the standard 1v. It does fine over a couple of octaves but does not track across the entire range without some attenuation. The slim is probably the same.

seank
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Sun May 22, 2011 8:08 pm

hmmm. it's way out of wack. i can't even get it to track properly over 1 octave. does the auto-tune feature on the phatty cause complications with this?

Sir Nose
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by Sir Nose » Sun May 22, 2011 10:08 pm

Yes, autotune must be off when using the pitch cv in.

seank
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Mon May 23, 2011 1:04 am

awesome. thanks for the tip.

slabwax
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by slabwax » Mon May 23, 2011 12:48 pm

Ok, its time to start laughing at me. I was under the impression that the vx351 and the vx352 are of no use with a little phatty is it different with slim? I have a lp st II w/cv mod should I pick one of these little boxes up?

EMwhite
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by EMwhite » Mon May 23, 2011 1:43 pm

I wouldn't say 'no use' but your $ would be better spent on a cp-251.

Unless you have a Voyager (in the case of the VX-351) or an RME (in the case of 351 and 352), the only functions that will be usefull are mults and attenuators. All of the other ins/outs are carried from DB25 cables from the Voyager/RME.

The CP-251, on the other hand has slew/lag, the mixer, it's own LFO clock, etc. and noise source and can therefore produce S+H.

At one point during design, I'm sure Moog considered using VX-351 as a breakout box for the Phatty CV mod but not all of the outs could easily be brought out to a 1/4" jack as many are digitally derived such as S+H and more importantly, would have required lots of tedious point soldering, not just the 5 that are part if the current mod.

Regardless of settings (panel) the 351 carries all LFO waves out simultaneously, at least on my Old School, Phatty has to select either panel based waves or sources for noise or S+H. The Mod buss out CV can therefore do all of this from a single jack but unfortunately, only when Mod whell is being used and the patch is set appropriately (not as flexible).
Last edited by EMwhite on Mon May 23, 2011 1:56 pm, edited 1 time in total.
'76 Minimoog, Taurus 3, Oberheim FVS + Son of 2-voice; Sequential ProOne; Juno 106; Moog Model 15; Kurzweil 250; Hammond M3; and a handful of Fender Basses Flickr!

slabwax
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by slabwax » Mon May 23, 2011 1:55 pm

To EMwhite ,

Thanks for that. That is what I thought. I do have a cp-251. And yes I'm sure if it made any sense for Moog to have made a breakout box for the lp they would have. I remember the want/must have list from the cv mod thread that Amos started a couple years back. A lot of folks wanted one pretty badly. But as a true greek I did have to raise the question, just to see if I needed to spend some more money.


thanks again
Dean

EMwhite
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by EMwhite » Mon May 23, 2011 2:15 pm

Yeah, my biggest (possibly only gripe with the way things worked out, especially now that GATE=50% fixes gate) is that pitch bend and glide do not carry through.
'76 Minimoog, Taurus 3, Oberheim FVS + Son of 2-voice; Sequential ProOne; Juno 106; Moog Model 15; Kurzweil 250; Hammond M3; and a handful of Fender Basses Flickr!

seank
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Mon May 23, 2011 3:41 pm

emwhite, what's the deal with GATE=50% ? i'm connecting my slim to a patch bay and that's the only input i can't find the correct resistor for.

EMwhite
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by EMwhite » Mon May 23, 2011 7:07 pm

seank wrote:emwhite, what's the deal with GATE=50% ? i'm connecting my slim to a patch bay and that's the only input i can't find the correct resistor for.


Shouldn't need one. The GATE IN jack is likely the only one that can get by without a resistor in Patch Bay. [no hum introduced by having an open ground and no offset if connected] Give it a shot and report back.

With regard to the 50% note above, originally, the Arpeggiator ran with the GATE time at 100% which meant that there was no discernible point at which an outgoing GATE could be sensed by another piece of equipment. For those of us with CV OUTs, this was an issue. Audibly, one could simply trim down the Decay on the filter or amp envelope to tailor the sound to suit a given situation but electrically, the Gate OUT wouldn't control another analog device.

Amos (within 3.1 code, currently still in Beta) implemented GATE LENGTH and now the ARP and GATE OUT CV works perfectly. I do not believe that this would have any effect on Gate In.

Again, interested to see how it works out for you.
'76 Minimoog, Taurus 3, Oberheim FVS + Son of 2-voice; Sequential ProOne; Juno 106; Moog Model 15; Kurzweil 250; Hammond M3; and a handful of Fender Basses Flickr!

seank
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Mon May 23, 2011 7:57 pm

okay, so with the gate in patched to the patchbay, it leaves the gate open just like using a dummy plug. if i add a resistor, it closes the gate, but also prevents anything else from opening it. does it need to be normalled? i'm lost...

oh and the volume input needed a resistor, but it doesn't negate the input on the patchbay the same way the gate does.

EMwhite
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by EMwhite » Mon May 23, 2011 8:41 pm

Did you try with patch bay configured as 'thru'? In either case, I'll mess with it when I get home and see if I can work something out.
'76 Minimoog, Taurus 3, Oberheim FVS + Son of 2-voice; Sequential ProOne; Juno 106; Moog Model 15; Kurzweil 250; Hammond M3; and a handful of Fender Basses Flickr!

seank
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by seank » Mon May 23, 2011 8:46 pm

yeah, i have it set up as a "thru" input. thanks for the help!

EMwhite
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Re: vx351 pitch cv out to slim phatty pitch in tuning issues

Post by EMwhite » Mon May 23, 2011 9:21 pm

seank wrote:yeah, i have it set up as a "thru" input. thanks for the help!


Not sure based on your comment above if it works now or not but I tested it on my Phatty (it's a Tribute) and it worked as it should in any of the positions [my patch bay is a Samson S-Patch plus so it has a switch for Thru, Normal, Half Norm]. Wired into the back in either the upper or lower jacks it works in all positions (no false firing of gate).

Should also mention that I'm using a standard TS (mono audio type) cable.

How about you? What worked, what didn't?
'76 Minimoog, Taurus 3, Oberheim FVS + Son of 2-voice; Sequential ProOne; Juno 106; Moog Model 15; Kurzweil 250; Hammond M3; and a handful of Fender Basses Flickr!

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