What are the typical tremelo and vibrato characteristics for electric organs, like the Vox Continetial and Farfisa organs?

I'd like some ball park parameter values, i.e. modulation frequencies around x Hz, and vibrato widths around y Hz to start off my pure-data model with.

1 Answer 1


Typical tremolo speed/rate frequency range:

0.1 Hz - 10 Hz

Higher frequencies will start to sound like actual tones and not tremolo pulses (source).

Classic rock BPM is probably around 120-160 bpm or so (1/4). If the tremolo is supposed to roughly follow the 1/8 tempo you'll end up around 4 Hz (but you may want to go a bit lower to match a triplet 1/4 feeling).

As for the vibrato tonal range or width - you can't specify that in a general Hz range, as the range changes logarithmically. I will specify that in cents instead.

Most vibrato/modulation ranges I have worked with goes from:

0.. +/- 100 cents (or +/- one half step)

Some models go to a full step (i.e. +/- 200 cents) though. To avoid too obvious disharmony it is preferable to modulate < 100 Cents

A value of 33 cents is probably not way off - it will make the tonal change noticeable while not causing obvious disharmonies.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.