Problem with tuning

[kom]

Hello,

I have the impresson, that my Xoxbox has a problem with keeping the tune. When a note is played until it fades out, it sounds like it is out of tune. I have attached an MP3 file and I would be very happy if someone could listen to it and compare it with his xoxbox.

Thanks
kom

xoxbox tuning problem kom.zip

(419 KiB) Downloaded 729 times

[antto]

sounds normal

note that the Filter can make the notes sounds like detuning downwards in some conditions
given that the cutoff is controlled by a decaying envelope, when the EnvMod is high, the filter is open (at a high cutoff frequency)
and as the cutoff goes down (especially when the decay time is short) the signal becomes "shifted" in time due to the phase response rapidly changing with the cutoff frequency (at low cutoffs there's more phase delay) so it sounds like the note pitch goes down during the decay
this is somehow similar to the doppler effect

[kom]

Hi antto,

thanks for your quick response and your detailed explanation.

I just recorded another example, cut off freq left, resonance middle, env.mod right, decay left, which shows the effect you described.

xoxbox tuning problem 2 kom.zip

(265.62 KiB) Downloaded 679 times

First I thought that there would have been a problem with the subatomic mods I implemented, so I am very happy with your explanation.

Thanks again
kom