vibrato

[Martin Czech]

:::You can use an analog delay chip (BBD) and modulate its clock with an LFO.  
:::The unmodulated delay time needs to be set around a nominal 30ms or so.  
:::Anything less would sound like chorusing or flanging, anything much more will 
:::start to sound like a small slapback/doubling delay.  Unlike a chorus or 
:::flanger, you don't want to mix in any dry signal, just use the delayed 
:::signal.  This is how it was done in the now-extinct BOSS VB-2 Vibrato pedal.

I guess only the wet signal is required, so no phase cancelation at all.


What will happen if the delay line gets longer?

In this case input sampling frequency can differ from
output sampling frequnecy, because considerable time
has elapsed between in and out.

It could happen that some part is sampled with min sampling
rate, and played with max, or both frequencys are the same.

So for considerable delay line length some modluation
frequnecys have no effect, others will have doubled shift,
and all in between. Depends in delay line sample length
and sample rate function, ... but the math is really ugly.

Is there any application for this?

m.c.