On the top is the inside of the poly~ object, in the middle is the main patch with equations, and on the bottom is the user interface. The standard parameters for fout/fin are in the range: 0 < fout/fin < 2įor the maximum delay as stated earlier: range 30 – 100 ms The user can of course use this pitch shifter to create many glitchy sounds when operating out of the standard values for each parameter. This allows for even less phasing and a cleaner pitch shifted sound. Using the poly~ object I was able to create many instances of this windowed phasor and put them evenly out of phase with each other. It is also helpful to add a second windowed phasor that is 180 degrees out of phase with the original this way reducing the noticeable phasing effect. Where fout and fin represent frequency out and in respectively, pfreq is the frequency of the phasor, and d is the max delay time (in ms).Īs it states in Miller Puckette’s notes on pitch shifting, it is necessary to window the output of the phasor with a half cycle of a sinusoid as to avoid discontinuities. The frequencies in the resulting sound can be determined by the formula: The maximum delay time should be in the range 30 – 100 ms in order to avoid noticeable echoes and to avoid a raise in frequency. The patch uses a phasor object to ramp the delay line length from zero to a maximum delay time specified by the user. :-) (And a little distortion here can work too - if a distorted sound is something you want.I built a simple pitch shifter with max for live using a variable length delay line. I sometimes use pre-distortion which seems to have a similar result.Īnd applying reverb (or other time-smeary things like delay or even a flange or phaser) after applying the pitch shifting can hide unpleasant artifacts - the audio equivalent of vaseline on a lens. I also want to point out that "massaging" your signal before and after the pitch shifting can make all the difference in the results.Īdding a light-weight band-pass filter before the pitch shifter can filter out many frequencies that aren't the fundamental and let the pitch shifter do a better job. I forget exactly what I use in my pitch shifting setup but it might well be Native Instruments Reaktor? The way we commonly avoid clicks when changing the amplitude of a sound is to interpolate smoothly.
If you're on a Mac, I think Apple distributes a free one, though I remember it used a lot of CPU. Continuous change of delay time causes a pitch shift.
There's a lot of work in some of those and they can give some pretty good results.
There are also commercial-grade VST and AU pitch shifters available which you could purchase and use in Max's vst~. I agree with the suggestions here so far for specific pitch shifting Max objects.
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