Muff's Modules & More

[jonat8han]

Having a lot of trouble calibrating my SH 101 - anyone used one to any success with Volta?

I'm using a 2408 mk3 - the calibration simply fails.

If I calibrate manually & load the 2408 mk3 default calibration, it tracks reasonably well within about 3 or 4 notes, but beyond that is pretty useless.

I've gotta say, I love volta but the manual calibration interface leaves a *lot* to be desired. I'd be much happier with just a simple text table of MIDI notes and levels? Or could manual calibration be done by pressing a MIDI key, then adjusting the output voltage until you're hitting the note you like, then hitting a "store" button, then moving on to the next MIDI key? Could probably work reasonably well with interpolation between points even just by hitting octaves.

This would also let those of us who want to do some alternate tunings!

I'm assuming the reason that the calibration fails is because the SH101 doesn't put out any simple waveshapes (sine or triangle)

If I leave the filter open, the calibration will only output one note, then quits.

If I close the filter all the way while outputting a pulse wave (the closest I can get to a triangle or sine wave on this thing) I get a variety of pitches, and the calibration sounds normal (like it does with any of my modular oscillators for example) then fails with no error messages or anything. sigh.

All of this is with the gate opened by a voltage from the modular, btw. I have no idea why Volta doesn't have the option of sending an "always on" in addition to trigger, gate, and ADSR.

Hope this all makes sense - anyone have any ideas?

[jonat8han]

an update - if I set the keyfollow parameter to 98, I get reasonable tracking over about two octaves with the default 2408 mk3 tuning table.

would still love to be able to actually calibrate this thing, though :-)

[Analog>Plugins]

I had this with the pro-1, what you need to do is bring the filter right down so the osc is a sine wave then it should track lovely.

I'm getting 6 octaves from the Pro-1. when the filter is open Volta has a lot of trouble locking onto the frequency. Just give it a nice loud filtered down sound and you should be laughing.

Oh and the other thing, with the Sequential Pro 1 you have to set it to drone as like you say it doesn't send a trigger output when calibrating which is odd? If you can't have the oscilator allways running without trigger then maybe try hitting a note with the longest release and hope it sustains long enough for the calibration to lock to it as you go into the calibration.

I havn't figured out how to save presets yet, maybe I should read the manual lol.

[jonat8han]

As I said in my initial post, I have tried closing the filter all the way to no avail.

My next attempt (tomorrow) will be running it through another filter that's a little more extreme - hopefully this will work, but it's a little silly. If my $50 rackmount tuner can track the pitch of a saw or pulse wave, why the hell can't volta? ;-)

[Analog>Plugins]

Maybe it's not getting enough volume? I had to experiment a bit with the filter setting on the pro 1 to get it to work.

[1nput0utput]

There are some suggestions here, too:
http://www.motu.com/techsupport/technotes/volta-oscillator-calibration -tips

[Analog>Plugins]

I'm having the same problem with the Yamaha CS-30 which seems to play fine but out of tune.

I set the synth to a middle C note, but as soon as you go to calibrate page the tuning drops so low as to be out of range so it can't calibrate.

If you take it out of calibrate mode you can play it fine albeit really out of tune/calibration?

Something is up with the calibration page that sends out a really out of range note. The CS-30 is Hertz/volts.

[Analog>Plugins]

Ok, I did a quick mp3 showing me at first playing the CS-30 through Volta then going to Calibration mode.

You can hear how it's gone from an audible pitch to a thumping sound, really odd.

Then you hear me come out of calibration mode to play the CS-30 through Volta again but still really badly out of tune.

Here is the mp3:
http://www.mediafire.com/file/igr2myf5dzm/Calibration error.mp3

Hope there aren't any pop ups, but take a listen any how.

[Analog>Plugins]

After more investigation it would seem that the calibration isn't sending out a note in the range that it needs to start the calibration process.

i.e if it sent out a C3 note it would be fine.

If I come out of Calibration mode the CS-30 jumps back to around C3 where I set it, as soon as you go into calibration mode it sends out a frequency that is more like an LFO than an audible signal.

I have checked the CS-30, it tracks fine with the midi to cv convertor and cv'd up to my other synths. I think the calibration needs calibrating lol.

Edit to add:

If when I hit calibrate I then instantly hit Preview on Volta I get random pitches....... if I then quickly turnoff preview sometimes it stops on a note that the calibration can start from???? Sometimes it nearly calibrates, how odd.

Stretta heeeeeelp.

[stretta]

[stretta]

[bar|none]

For summing with a DC offset. You can use this .wav file which is a constant DC voltage (straight line).

http://experimentsinanalogchaos.com/samples/DC_cv%20faker.wav

What I do is load this file into a sample player (not sure which host you are using). In Ableton, I load it into Sampler or Simpler and set it to loop forever, then I can use it as a DC source to sum with another.

[Analog>Plugins]

Stretta, I think something is a little borked with the calibration in Volta.

If I take the CV in and disconnect it from the CS-30 leaving the output of the CS-30 plugged into an input that volta can see..... I can get the red bar in the calibration to track it perfectly.

The CS-30's sine wave is as good as any sine wave out there.... I mean a sine wave is... a sinewave.

Volta will play the CS-30 until you go into calibration, as soon as you do this Volta sends out a really really low LFO type frequency... only if I move the CS-30 oscillator to the highest register can I nearly get it to track.

Then if you come out of Volta it won't play at all and you have to restart it... probably due to the calibration failing.

There is something goofed on the calibration stage maybe? Or maybe not broken but needs something added to it like a starting pitch for calibration. If you play the mp3 I uploaded you can hear the CS-30 being played by Volta happily if out of tune.

Hmmmmm, if I take out the cv in from the CS-30 it holds a nice steady pitch, as soon as I plug a jack lead into it (without the other end attached it drops to almost LFO speed), when I then plug the other end into a cv output from Volta it is playable again........

But as soon as you enter calibration mode it drops back to LFo sounding as if it was C minus 4 octave or something.

So what we need is a starting note output for the calibration mode for synths like the SH-101 and the CS-30. There is absolutely nothing wrong with the CS-30, it tracks over a good range when attached to other cv/hertz synths and midi to cv converters.

[stretta]

What you're describing leads me to believe a different calibration sequence is required for Hz/V synths. I'm only speculating, though.

Does the CS-30 only respond to positive CV voltages?

[Analog>Plugins]

I'm not sure about positive or negative voltages on the CS-30 Stretta, I'm not too good on the electronics of things. But it seems to be tracking 5-6 octaves of audio within a couple of octaves of keyboard range

I could hook up the midi to cv converter and set it to the CS-30 then measure the voltages maybe?

I think the problem is this, as soon as you enter the calibration mode Volta stops sending pitch data (I think) or at least it goes to sub zero frequency as it waits for you to hit the calibration button.

But as it is nowhere in range it can't calibrate. The odd thing is if I hit the preview button, loads of random voltages are chucked out and if I'm lucky I can quickly turn off preview and then hit calibration if the preview random voltages sent out manage to fall within the starting calibration range.

I hope this all makes sense. The Pro -1 when you plug in a cv cable just goes to around middle C even if the other end is not attached to it but the CS-30 goes to a very low frequency as soon as a cable is plugged into it. This I think is where the problem is.

Hope this helps and that I'm not being annoying with finding these bugs (used to beta test a lot for Native Instruments).

[stretta]

[Analog>Plugins]

I have no way of trying that really. It seems that the moment you go into calibrate Volta stops all voltages so the CS-30 reverts back to the lowest pitch it can go.

To be honest I'm not sure really how to do the bias thing in the software and the hardware idea is not doable with the kit I have.

I think I'll wait for an update to volta, what we need is the ability to set a certain pitch in volta when calibrating cv/hz synths... actually I'm not sure what is needed to get it to work.... all I know is that I have 3 x cv/hz synths that need intergrating with Volta.

I'm sure you can figure something out, I would be happy to do a video and post up in a couple of days maybe of the troubles I am having?

Stretta did you listen to the audio file I posted earlier?

[Analog>Plugins]

[stretta]

[Analog>Plugins]

Ahh that explains it a bit better,... so one instance running normal and another instance to push up the voltage on the same output so that calibration might work. I'll give it a go.