I am playing with my first aout_lc but am having trouble getting the cv’s to sound right:
In calibration mode, all is fine.
I got the min and max voltages perfect on calibration and 1v, 2v, 4v, and 8v sound like perfect octaves thru the oscillator,
but as soon as I exit the calibration mode and start sending the midibox cv midi notes, the intervals are completely out of tune(4th become a semi, octave, a 3rd etc).
I checked that the curve is V/oct and that I have my hardware set up correctly (I switched to resolution mode A)
Any ideas?
oh, and I replaced the trim pots with multiturn for more precision, was this a mistake?
so far I remember, I only tested the calibration mode with a AOUT, but never with a AOUT_LC module… it could be a bug, but I’m not sure (because the implementation is straightforward)
When the CV output is assigned to a CC (e.g. modulation wheel), do you see a linear change with increasing CC values?? If not, it’s a hardware problem
I have tried cc mode, but cant get any cv from either channels (tried mod wheel and many other cc messages) .
Pitch mode is perfectly consistent to Dr Moog’s v/octave law but only for values 64 and above (scales become random below 64).
Velocity mode on the other hand works perfectly normaly: 127 is a perfect octave above 64 that is a perfect octave above 32, etc
I guess I could just use the velocity mode and write a buffer handler that would change incomming midi notes into velocty values before treating them, but it seems strange that nobody else has encountered my problem…
wouldnt be suprised if I got something wrong on the hardware side, but this is the second aout_lc i built and exact problem repeats itself, would be a strange coincidence
thanks again for your help, cant wait to start analoging
the usage of another software to convert a note value to velocity just sounds “perverse”
I think there are two problems: one in the configuration, another on your AOUT_LC board.
Configuration: doublecheck the settings. Use the select button to check the other channels as well. If you are unsure, just upload the application again - you should get the default setup with linear curve. The calibration is only hardware specific (you adjust the pots), there are no related values which would be stored anywhere
Hardware: check the output voltage of the R-2R latter - does it behave linear? If yes, the error might be around the OP, if not, maybe a resistor of the R-2R latter has no contact?
Today I tested the calibration with a MBHP_AOUT_LC module, it works.
