Yes, it's possible that the circuit in the MonoPoly isn't an antilog
circuit; but still the calibration involves some scaling. It's apparently
not completely linear, is it?
As far as the three voltages go: This is exactly what the other antilog
calibrations do, too.
The Trident requires to press the same key 8 times to load the DAC with the
same voltage. This is done for three different keys (C1, C3, C6).
The Poly-61 uses unison mode but measures just for single voice (apparently
after the demultiplexer).
So my guess is that three voltages are indeed enough.
If I'm not mistaken the antilog circuit for the Polysix has four trimpots
(at least in the new version): one each for low, mid high and another one
for a general offset. I think the old version only had three pots.
At 15:08 Uhr -0800 28.02.2014, Bob Grieb wrote:
> Yes, it seems we can get three different static DAC values, but I am not
>sure that
> is enough to calibrate the anti-log circuit. I tried the test, and saw
>roughly 0,2.5 and 5V
> on the output of the DAC. I pressed lots of front panel switches.
>Other ones also affect the voltage, but it seems there are only three
>choices. Seems like you would want more voltages, and specific ones that
>were chosen for the job. The circuit in the Monopoly that is being
>adjusted is not logarithmic, it seems. Just a gain stage.