[sdiy] Dry/Wet effect relay that makes 'click' noise on changes...

[Mattias Rickardsson]

Slow fades are quite unusable in a sequencer-driven environment where
the switching is part of the sweet music. Signals will need to get
switched on "momentarily" (which can mean different timeframes for all
their frequencies), otherwise transients will get lost. At the same
time it's best to not switch the bass and the DC quite as quickly.

The Boss FET solution is great for what it is, but most people are not
playing the electronic part of their rig with their feet anymore. ;-)

/mr


On 11 January 2016 at 12:59, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> On 11 Jan 2016, at 11:18, Mattias Rickardsson <mr at analogue.org> wrote:
>
>> On 11 January 2016 at 11:44,  <rsdio at audiobanshee.com> wrote:
>>> Rather than a fairly complicated and expensive circuit like a sweepable filter, why not just fades from full volume to mute?
>>
>> Because the long time needed for gently fading bass frequencies is too
>> long for the higher frequencies if they need to be perceived as
>> starting or stopping immediately. :-)
>
>
> In practice, this isn't such an issue as it might appear, at least for stomp box use. The lowest note on a guitar is 80Hz, iirc. That's a 12.5msec period. Fading it in or out over 10-20msecs avoids a click, and is fast enough to be imperceptible. After all, you don't know exactly when the switch is going to engage, so there's no perception of a delay ("I pressed it, I waited, then it came on"). Instead, you perceive it as having happened when it comes on, even if the switch actually engaged a moment sooner.
>
> A slow-fade is exactly what the Boss FET switching does. For example, the CE-2 chorus pedal uses a 1M and 47n LPF on the signal coming from the bistable to slow the rise/fall time and make a soft fade in/out. That's a rise time of over a second, but the FET's response won't be that linear, so the overall effect isn't of a 1 second fade in.
>
> Tom
>