[sdiy] LFO control - frequency or time?

[Neil Johnson]

Hi all,

Ok, here's a good point for discussion:

In my latest design on the bench I have a VCLFO which so far has a  
range of about 125us (8kHz) to roughly 120s (8mHz).  I think it could  
go even slower, but so far I don't have the patience to sit there  
with an hour-glass and time it.

So I got to thinking: for a CONTROL oscillator is it more useful to  
think, and program/use/set/twiddle, in terms of TIME (how long a  
cycle takes) or use the same concept of FREQUENCY as for the audio  
oscillators?

I open the debate with the view that it should the TIME - for a  
slowly-varying control signal I think it makes more sense to think in  
terms of how long a modulating cycle will take.  Saying	
	"I want a slowly varying modulation over 54 seconds"
seems more natural and intuitive than saying
	"I want a slowly varying modulation rate of 18.5mHz"

Comments welcome!

Cheers,
Neil
--
http://www.njohnson.co.uk