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Is There a Problem w/ My Pro One
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Jean Luc Cougar
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#1
14th July 2013
Old 14th July 2013
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Is There a Problem w/ My Pro One (DIY Repair Advice Needed)

Hi guys,

I am wondering if there is a problem w/ my Pro One (or if I simply don't have the experience).

Essentially, I am wondering why my Pro One isn't going low enough?

Here's what I am experiencing:
when I play the lowest C on the keyboard, with only Osc A on, set to Octave 0
(with no modulation, no other Oscs turned on, etc) the note that sounds is G#2.

I am pretty sure this means I need to adjust the tuning, however, let's pretend it the tuning was intact and it sounded a C - Is C2 the lowest note that Osc 1 can play on the Pro One?

I have figured out, I can get lower if I use Osc 2 set to Octave 2, select two waveforms (in this case I did saw and tri), and if I turn Low Freq and Keyboard On I get notes in the 0 Octave range. Is this normal?

Thanks for any help with this, and sorry if this is noobish. Trying to determine if it's user error or if I need to get this synth serviced.

EDIT: I just tried one of the patches from the manual "E-Bass", and it doesn't play at all in the bass range, it only goes down to just under 300 hz. Here's the patch: http://www.flatline.net/Projects/Aud...ges/EBassL.gif

Any thoughts on what this issue may be?
#2
14th July 2013
Old 14th July 2013
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audioconsult is offline
why you dont tune it an octave lower? or maybe it is one octave higher as it should be allready..than just tune according the factory specs in the manual.
Oli
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14th July 2013
Old 14th July 2013
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Might help to post some audio with your complete patch settings.

Do you have any test/measurement equipment?
Jean Luc Cougar
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14th July 2013
Old 14th July 2013
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I will in the AM.

If you check my OG post, I patched the patch that I linked and nothing like a bass, in fact nothing below 300 hz.

All I have at the moment is a spectrum analyzer (I will be buying a multimeter this week)

Thx!
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14th July 2013
Old 14th July 2013
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Try it just with Osc B, or try Osc A with the Osc Sync switch off (Osc A is tied to the frequency of B when sync is on and may be the source of your problem). If Osc B is not going near C-0 (or whatever) you may need to get it serviced.

The Pro-One should go pretty damn low even without low-freq engaged.
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14th July 2013
Old 14th July 2013
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Quote:
Originally Posted by Jean Luc Cougar View Post
I will in the AM.

If you check my OG post, I patched the patch that I linked and nothing like a bass, in fact nothing below 300 hz.

All I have at the moment is a spectrum analyzer (I will be buying a multimeter this week)

Thx!
forget about multimeters..just read the ****ing manual.. do i really need to google it for you?

You will learn a lot reading it..its writen for people that have never seen a synth before and explains in detail how to tune them
Jean Luc Cougar
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14th July 2013
Old 14th July 2013
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Okay, at the suggestion of Oli, I have recorded audio of the following patch:

The only difference is I have set both Osc A Octave and Osc B Octave to 0 (zero).

(Audio is attached below at the bottom of this post, also available HERE on Dropbox).

The audio contains 4 examples:
1. Osc A only, (set to Octave 0) playing the lowest C on the keyboard.
2. Osc B only, (set to Octave 0) playing the lowest C on the keyboard.
3. Osc A only, (set to Octave 0) playing the lowest C on the keyboard. With Lo Freq engaged. (this sounds the same as 1, as Lo Freq doesn't affect A)
4. Osc B only, (set to Octave 0) playing the lowest C on the keyboard. With Lo Freq engaged.

Does this seem right?
Set at Octave 0 (zero), w/ Lo Freq OFF, the lowest note that sounds is C3 (approximately 260 hz).
The manual states that Lo Freq "Extends OSC B range to sub-audio frequencies", however, based on what I am hearing and seeing (example 4) - it is indeed audible.

Is this synth somehow tuned an octave (or two) too high?

Thanks again guys! I am trying to do my best with the manual, however, having never owned an SCI, I don't know what "normal" is for this.
Attached Files
File Type: mp3 ProOneOscTest.mp3 (668.4 KB, 23 views)

Last edited by Jean Luc Cougar; 14th July 2013 at 07:11 PM.. Reason: clarity
#8
15th July 2013
Old 15th July 2013
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Yeah, your tuning (or something) is definitely off by a couple of octaves. I guess you could try adjusting the scale yourself but if (like me) you're in any way unsure about this kind of stuff take it to a tech.

If you have another cv source try connecting that to see if it's not a problem with the keyboard scale rather than the oscillators.
Jean Luc Cougar
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16th July 2013
Old 16th July 2013
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Thanks to those who have chimed in.

I am going to attempt to calibrate this myself before taking it to a tech. I have done some minor repairs, so I think adjusting the trims should be within my grasp.

Quick questions before I attempt this (Manual for reference - all on page 4 and 5):
1. Is this most likely "Tuning"? "DAC Scale"? or just the "User Trim"? Just trying to zero in on what I need to do.
2. It looks like adjusting "DAC Scale" or "Tuning" requires the synth to be opened. I assume this is fine to do / adjust with it powered on as long as I don't touch anything near the power supply?
3. Any other thoughts?

Thanks!

Last edited by Jean Luc Cougar; 16th July 2013 at 04:48 PM.. Reason: clarity
Jean Luc Cougar
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17th July 2013
Old 17th July 2013
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Bump:

Is this most likely "Tuning"? "DAC Scale"? or just the "User Trim"? Just trying to zero in on what I need to do, and what order I do them in.

Thanks!
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18th July 2013
Old 18th July 2013
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Are you sure it isn't a bender wheel problem?
Jean Luc Cougar
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18th July 2013
Old 18th July 2013
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Quote:
Originally Posted by dougt View Post
Are you sure it isn't a bender wheel problem?
It actually may be, the bender is currently non-functional.

Is this common? Is there any known way to fix it?
I did some googling and came up with nothing.

(thanks btw!)
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18th July 2013
Old 18th July 2013
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Can't help you with the pitch wheel, however if you do end up opening it up make sure you carefully disconnect the keyboard ribbon cable from the main board before you open it up entirely as the pins on the end seem to break quite easily. Replacement ribbons are available from Wine County if you do break it
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18th July 2013
Old 18th July 2013
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Quote:
Originally Posted by tapedseams View Post
Replacement ribbons are available from Wine County if you do break it
Or you can get one from me for a lot cheaper.

Disconnect the wheels by disconnecting their cable inside and power up. Are the pitches normal then?
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18th July 2013
Old 18th July 2013
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Quote:
Originally Posted by dougt View Post
Or you can get one from me for a lot cheaper.
Good to know. Thank-you.

You are also the developer of the Pro One Turbo kit, correct?
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Jean Luc Cougar
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19th July 2013
Old 19th July 2013
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Quote:
Originally Posted by tapedseams View Post

If you have another cv source try connecting that to see if it's not a problem with the keyboard scale rather than the oscillators.
Okay: I used my Kenton as a CV source, when I trigger a C0 note from that, w/ both octaves set to 0, it plays a C2 (130 Hz when I look at with a spectrum/oscilliscope).

Quote:
Originally Posted by dougt View Post
Are you sure it isn't a bender wheel problem?
I tried as you suggested, and sure enough when I play key C0, it triggers near a C0 (I adjusted the frequency knobs a bit).

So, does this seem to be as simple as ordering and replacing the pitch and mod wheels? If so, let me know and I will email you about costs / etc.

Thanks guys!
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