01-01-2021, 12:45 AM
(This post was last modified: 01-01-2021, 12:48 AM by mvdirty.
Edit Reason: Added a missing word and some details regarding other outputs and degree of testing thereof.
)
I noticed this to a minor degree back when first setting up my NerdSEQ and expanders, and followed this thread as it was posted. Today, though, during some setup and metering and patching I observed it occurring strongly enough on one of my CV16 outputs that it would be out by a semitone if I went beyond setup and metering via the Sinfonion (which is my main pitch destination and which I used today to check and calibrate all of the outputs on two NerdSEQs with three CV 16 expanders.)
Perhaps interestingly, I’m not observing just an offset or a linear over-scaling or under-scaling of the values but rather a non-linear response, at least on this particular CV16 output. Other outputs fare better, but not all have been checked in as much detail. Most have been checked just in terms of min, max, and midpoint, with and without the -5V switched offset.
I suspect NerdSEQ could benefit from a calibration process utilizing more (hopefully far more) than two points, not unlike how is the case for some VCO calibration modules ala CalTrans, even if just for the CV16 expanders if the main module couldn’t spare the memory for it, but even better if it could.
How about it, Thomas, could we at some point have eleven-point calibration for every output (and perhaps the inputs too?) A value for every volt?
Perhaps interestingly, I’m not observing just an offset or a linear over-scaling or under-scaling of the values but rather a non-linear response, at least on this particular CV16 output. Other outputs fare better, but not all have been checked in as much detail. Most have been checked just in terms of min, max, and midpoint, with and without the -5V switched offset.
I suspect NerdSEQ could benefit from a calibration process utilizing more (hopefully far more) than two points, not unlike how is the case for some VCO calibration modules ala CalTrans, even if just for the CV16 expanders if the main module couldn’t spare the memory for it, but even better if it could.
How about it, Thomas, could we at some point have eleven-point calibration for every output (and perhaps the inputs too?) A value for every volt?