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Peculiarly, when I build the rack version I found that less precise caps with more deviation from ideal value by up to 10%), yields better tuning results of octaves, gain and attenuators. This required measuring all caps and reiterating all calculations with various cap selections.Caps plus resistors define the octaves, while those resistors also define gain, which has to be compensated for (using the spreadsheet), which then affects the max gain and/or mid position of the pots (as for rotaries with fixed resistor values close to impossible to match across L and R). So working backwards kind of seemed better to me. The reason being too much interaction, double/triple role of components.Not tested but my hunch is this 'problem' could be fixed by introducing an additional gain stage after octave filter and before the pots/rotaries to get equal gains before attenuators. Also, then rotaries make sense.
Peculiarly, when I build the rack version I found that less precise caps with more deviation from ideal value by up to 10%), yields better tuning results of octaves, gain and attenuators. This required measuring all caps and reiterating all calculations with various cap selections.
Caps plus resistors define the octaves, while those resistors also define gain, which has to be compensated for (using the spreadsheet), which then affects the max gain and/or mid position of the pots (as for rotaries with fixed resistor values close to impossible to match across L and R).
So working backwards kind of seemed better to me. The reason being too much interaction, double/triple role of components.
Not tested but my hunch is this 'problem' could be fixed by introducing an additional gain stage after octave filter and before the pots/rotaries to get equal gains before attenuators. Also, then rotaries make sense.
