[sdiy] Delayed LFO fade-in time

[Quincas Moreira]

"Doesn't the attack rate need to be variable.  If you set the LFO
delay to zero, then you want it to kick in immediately at the onset of
each note, not ramp up with any attack time.  But if you set the LFO
delay to 1 second, you certainly don't want the LFO modulation to kick
in instantly at t=1s because there will be a discontinuity, so it
needs to fade in."

Yes, exactly.  With 0 attack time (fast attack) the LFO starts acting
immediately, no delay.  As you make the attack slower on the EG
controlling the VCA which controls LFO amplitude you get longer delay.
In fact, technically this is not a delay but a fade-in.

On Tue, Mar 15, 2016 at 7:10 PM, Adam Inglis <21pointy at tpg.com.au> wrote:
>
>> On 16 Mar 2016, at 9:19 am, Tom Wiltshire <tom at electricdruid.net> wrote:
>>
>> Perhaps they'd have implemented separate per-voice VCAs for the single LFO if they'd had a bit more budget.
>>
> But given how in the eighties it was all about emulating “real” instruments, perhaps they didn’t think it was necessary. Cellists, guitarists, flautists… when they apply delayed vibrato, it is only ever monophonically. And the vibrato in these cases - the onset, the speed, the symmetry - is peculiar to each player, it is like a signature.
> I can’t think of a non-electronic polyphonic instrument where delayed (user-controllable) vibrato exists. But of course, sometimes you want to emulate a bunch of individual monophonic instruments playing together...
>
> Richie, take a look at the how the CZ line do it, and avoid that method! I find them too abrupt in onset (fade time too short)
>
> Adam
>
>
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-- 
Quincas Moreira
Test Pilot at VBrazil Modular