Little Phatty Stage II CV Mod Tracking Problem

[amphonic]

I just received my new Little Phatty Stage II with the CV Output Mod. I am having problems using it to control a Synthesizers.com Oscillator. It seems like the Little Phatty is not actually sending 1volt/octave from the Pitch CV Out. A scale starting at E tracks to 25cents short of Eb one octave up. I hooked up my handy Multimeter and it confirms my suspicion, the Little Phatty is not sending 1 volt per octave. Is there a way to calibrate the Pitch CV Out to work at 1 volt per octave?

I am pretty frustrated at this point.

Thanks
Amphonic

[Sir Nose]

I wonder if it's because the LP functions at .95 or .97 volts/octave internally. Just a tad less than 1. When the CV out mod was proposed on this forum I ask if the CV out mod would send a full 1V/octave and was told yes. This was by a member of the forum quoting info he was given by Amos.

http://www.moogmusic.com/forum/viewtopi ... c&start=30

I sure hope it's not an issue with all CV out mods. I was hoping to get the CV out mod myself and would need to reconsider if it does not play well with others. If you have a CP-251, you should be able to play with the signal till it tracks properly. Just a lot of fiddling.

[amphonic]

Thanks, I dont have a CP-251 but I do have a Signal Processor to fiddle with the CV, but that is not exactly a fun way to spend the evening. The CV mod is advertised as 1volt per octave on at the Moog Music site so I am guessing mine is not quite right or I am missing something obvious.

[amphonic]

Contacted Moog Support via email. It seems my Phatty was calibrated incorrectly. The fix should be pretty easy. A trim pot inside is used to adjust the volts per octave.

[Sir Nose]

nice

[///OSS]

I wish that could be used for the CV ins as well, as I was never able to use the LP with other 1v/oct devices due to the .96 or .97 system it uses...sucks, as I did try with the CP but it was a pain in the arse. too sensitive and the notes just always sounded funny as it tracked up or down.

[sine]

Contacted Moog Support via email. It seems my Phatty was calibrated incorrectly. The fix should be pretty easy. A trim pot inside is used to adjust the volts per octave.

Can you do it yourself? If so, where is the trimmer and how do you get at it?

[popgoblin]

Did anybody else experience problems with the CV out? My Stage II with factory installed CV out is way off...

br
Morten

[Sir Nose]

CV out should be 1v/oct.

CV in is .97v/oct or there abouts

[popgoblin]

My problem is more that, for instance, C3 is more like "F3" compaired to other equipment.... Can that be adjusted somehow? I've tried all the calibration rutines...

[stiiiiiiive]

Hmm… F-based keyboard on the controlled equipment, isn't it?

[popgoblin]

F-based? Is that a thing?

My other CV-capable equipment (Elektron Analog Four, Anushri, ES-1) is waaaaay better calibrated, so the Little Phatty's... erhm "deviant" behavior surprises me....

[stiiiiiiive]

I saw this between some "regular" CV'd equipment and a MG-1, which is precisely F-based. As I understood your scale is right but offset by -say- a fourth (C to F), I had this idea.

Now if you think something is wrong, you definitely should write/phone to Moog techs.

[popgoblin]

will do - thank you for your input!

[David Smyth]

I wish that could be used for the CV ins as well, as I was never able to use the LP with other 1v/oct devices due to the .96 or .97 system it uses...sucks, as I did try with the CP but it was a pain in the arse. too sensitive and the notes just always sounded funny as it tracked up or down.

When I sent my 3 Phattys (1x Little St. II, 2x Slim) to my local Moog tech (for another problem), I also got him to calibrate all of the Pitch CV In's to 1v/octave.
It can be done..

David.
NZ