I’ve got a curious issue.
I’ve been using and enjoying the CV inputs and outputs on the Pyramid for years now. Squarp guided me through the modification required to remove a few of the SMD components and correct a problem with the CV outputs from the first generation of Pyramids, and so far I haven’t had any trouble. Love my Pyramid so very much.
Recently I restored an MC-202 and thought I might like to use it live in place of the Roland Boutique SH-01A.
The CV inputs are quantized, so they sound really bad. To correct this I added a modification which provides proper CV and Gate input. The modifications went well, and the device is beautifully restored and functional. Great story, right?
Well… for reasons which I can’t understand the tuning of the MC-202 is correct internally, it is correct using the Arturia Keystep’s Pitch and Gate outputs, it is correct using the Roland CSQ-600 as the sequencer, but when I connect the Pyramid is goes completely wrong.
At middle C is G3 plays the C3 note.
At C1 - it ls just a little flat.
By C5 were are on the moon.
The calibration tools provided within the Pyramid to adjust for CV mis-calibration don’t correct the problem. I can use them to tune the C3 to be a C3 - a few coarse steps, and then some fine % until it’s right, but by the time we play away a few notes it begins to come out of tune again.
Normally I would open the MC-202 and recalibrate it - set the spread correctly, and internally tune it to the proper voltage and then assume that the problem was the MC-202. Makes sense.
But this problem is only with the Pyramid. Everything else plays nearly 5 octaves in tune.
Further, the internal CV voltages (not using my modification inputs) do play correctly, but you can hear the CPU quantizing, and attempting to adjust the incorrect voltages from the Pyramid to the correct notes of the CPU. It becomes totally Vocalign, and unusable.
What the heck is going on?
The interesting thing is that using the same Pyramid, same cables and same pitches with an SH-101 there is no problem at all. It’s just fine. With Eurorack gear it’s also fine. No problem.
This is the first CV/Gate device which has not been what I would call “compatible” with the Pyramid since being guided through the correction to adjust the CV/Gate outputs and inputs years ago.
I’d love any input or thoughts you might have. Has anyone else encountered anything like this?