Base on our researches, the traditional subtractive synthesiser has a whole step vibrato. But in Reaktor what we actually found out was that the amplitude control of the LFO default setting range was 0 to 1. It is good for the amplitude modulation for tremolo effect with the default setting. But for vibrato 0 to 1 only give us half step vibrato. Because the setting 0 to 1 amplitude is multiply by the +1 to -1 bipolar wave shape so the output is +1 to -1 and that +1 to -1 is added to the notepitch and for example, if we play A above middle C that is note number 69 and that +1 will give up to note 70 and -1 will lower to 68 therefore we will only get half step vibrato with the setting range of 0 to 1. If we will set the LFO's amplitude range from 0 to 2 that mean with 0 there will be no modulation and with 2 that will give us a whole step up and whole step down. We really hope that this will help you as well because this kind of small problem sometime difficult to notice. Below, as you can hear the sample recorded between whole step and half step vibrato. And they were set to the same frequency and played the same note but with the different LFO's amplitude range setting. Half step with range from 0 to 1 and whole step with range from 0 to 2.
Half step vibrato
Whole step vibrato
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