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gravity wrote:heavy processing can quite easily alter the perceived pitch of a sound. especially when dealing with distortion, banpass and highpass filters, and more esoteric things such as formant filters and bitcrushing.

ive experienced with this myself, where a kinda squelchy modulating noisia-esque sort of bassline i made sounded most in tune with a sub bass playing six semitones different to it.

some filters will compensate for level increases when the resonance goes up by bringing the volume down which could quite easily change the predominant frequency to the cutoff rather than the fundamental. also if your filter self oscillates that will mess up the tuning.

amphibian was right though - do what sounds right. numbers and stuff are all great, but you don't hear those when you play the track do you?

Phigure wrote:

amphibian wrote:

CMACD wrote:For some weird reason in the track I'm working on, it sounds more "in tune" that the note I'm playing on this particular midrange bass sound is a semitone lower than the sub (and yes I checked the pitch of the oscillators and everything). Just find it kinda weird and was wondering if anyone else noticed this??

I don't have a technical answer for you - but "pitch" inadvertedly gets affected (i don't think it's the actual pitch, but our ears make it out like it is) just by playing with cutoff and resonance - considering that formant filters are a combination of these two, I would not be surprised if that's the case.

sorry, but that's completely wrong

pitch is not affected by filter cutoff/resonance... our ears don't make it out like pitch either. filters just add/remove/attenuate/accentuate certain harmonics. they don't change the pitch

Phigure wrote:For the sake of simplicity, let's say we've got the signal pictured below

the fundamental frequency would be 2 Hz, with 4, 8, and 16 Hz being harmonics. For example, let's say that 2 Hz is a note called X, 4 Hz is X up one octave, 8 Hz is also X (up another octave), and 16 Hz is yet again also X (up another octave).

A lowpass filter, will simply decrease the amplitude of any frequencies above the cutoff frequency, sloping downwards at different angles depending on the filter strength. What resonance does is introduce a peak just before the cutoff frequency, amplifying any frequencies in that range. So when you change the cutoff of a filter, you're changing the location of the resonance, which means that different frequencies are being accentuated. This doesn't change the note though, because the large majority of frequencies will be harmonics of the fundamental.




(it's crude, I know)

here's a better picture I found of a resonant filter

Sharmaji wrote:played-out sound is played-out