| Author |
Silly pitch |
| worker8 |
I'm new to Volta and wonder why the calibration process is so unpredictable.
Now, I tend to calibrate with a louder signal. And I can play easily through 3 octaves.
Is this the only thing I missed ?
I use a MOTU Ultralite mkIII, and play with ZO, A-143-9 & A-110. |
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| 1nput0utput |
| Are you sure that you're not clipping the audio interface input that you're using for calibration? If I recall correctly, all of the UltraLite mk3's inputs have a trim control. A strong signal is good for calibration, but it will be distorted if it's too strong. |
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| worker8 |
| 1nput0utput wrote: | | Are you sure that you're not clipping the audio interface input that you're using for calibration? If I recall correctly, all of the UltraLite mk3's inputs have a trim control. A strong signal is good for calibration, but it will be distorted if it's too strong. |
I don't notice any clipping : I always have an open scope to monitor the incoming signal. Furthermore, my recordings are clean.
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| 1nput0utput |
| According to the Volta manual, the UltraLite mk3 analog outputs 1 through 8 produce ±3.5 VDC, which should correspond with about 3.5 octaves from a V/octave oscillator. The main outputs produce ±4.6 VDC, so try using one of the main outputs instead. You should get another octave of pitch CV tracking. |
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| os |
| ±3.5 V is a 7 V range i.e. 7 octaves. I speak from experience. |
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| worker8 |
| os wrote: | | ±3.5 V is a 7 V range i.e. 7 octaves. I speak from experience. |
Don't you need a +3,5V offset to feed the VCO with a 0-7V voltage ?
I need to check the input range of my VCOs ... |
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| os |
That would depend on your VCOs. Most that I'm aware of take both positive and negative voltages. Possibly Buchlas take positive only, though I may be making that up.  |
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| doctorvague |
| os wrote: | | That would depend on your VCOs. Most that I'm aware of take both positive and negative voltages. Possibly Buchlas take positive only, though I may be making that up. |
I agree, the examples I've seen where only a positive voltage would work was with the MS-20 and a couple of other vintage monosynths (Roland SH-xx for example don't recall which one). Maybe with the Buchla as an exception, I think most modern modular oscillators will accept negative CV's. Otherwise you couldn't even do simple vibrato or frequency sweep with a standard LFO>osc. |
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