It would maybe be possible to examine this further, but it's not going to change the fact that your module is behaving strangley. It would indeed be interesting to hear from someone with the same module.
It would maybe be possible to examine this further, but it's not going to change the fact that your module is behaving strangley. It would indeed be interesting to hear from someone with the same module.
What's the voltage range you're using? 0-1V or something higher? What about the result for several octaves, is it only the lowest note that's sharp?
Even already quantized control voltages should not be used as CV source for the module. In this case similar problems may occur if the voltage steps of the incoming signal are close to the voltage thresholds of the A-156.
I can't see how this is relevant in this context. If the module is correctly calibrated a voltage that isn't close to the thresholds should always be correctly quantized. It doesn't matter if it comes from another quantizer, a keyboard or a random S&H.
I don't have any experience with this VCO, but I see that it supports different scales. Do you have the same problem with all scales? Have you tried to give it controlled voltages around the level that should result in a C to see if you can get that C at all on how much it's off?
The calibration mode seems to be quite helpful. As I understand it, it will report the measured voltage. What's it saying about the C that's played as a C#?
I don't have any exprience with this module, but unless all your racks are running close to their power limit it really sound like something is wrong with the module.
I'd recommend to do current measurements to see if it exceeds the rated 160mA on any of the rails.