Re: Fading sound in and out

Thanks Norbert.

On Tue, Aug 26, 2014 at 2:29 PM, Norbert Schnell <Norbert.Schnell@ircam.fr>
wrote:

> ... this is my favourite behaviour for the fading play/stop (wish I could do this is one line).
>   http://jsfiddle.net/NorbertSchnell/ot61j1ue/
> N.
> On 26 Aug 2014, at 12:04, Norbert Schnell <Norbert.Schnell@ircam.fr> wrote:
>> The current behaviour of the "xxxToValueAtTime" and the code that it requires is really not that great.
>> 
>> In Chinmay's example it causes clicks as he describes and in Chris' example causes clicks when clicking "play" during the fadeout or "stop" during the fadein.
>> 
>> What I would expect is that calling the function "linearRampToValueAtTime" would use the current value at current time as a start point and ramp from there to the given value at the given time. In that case the fade times are always respected (even though the slopes wouldn't).
>> I could not think of any scenario in which this behaviour would not be desired, do you?
>> 
>> Norbert
>> _____________________
>> N o r b e r t   S c h n e l l
>> { Sound Music Movement } Interaction
>> IRCAM – Centre Pompidou
>> 
>>> Actually, your problem is you're not setting the start point for the linear
>>> ramp appropriately; you setValueAtTime(0) when the context is created, But
>>> you need to additionally set it when the play or stop button is pressed (to
>>> give it a start value and (more importantly) time for the ramp.  See
>>> 
>>> http://jsfiddle.net/9La05fg5/11/
>>> .
>>> 
>>> What's happening now is whenever the click methods are called, the start
>>> time and value for the ramp is whatever the last schedule event was - e.g.,
>>> if you loaded the page and waited three seconds, then clicked play, the
>>> linear ramp will have its start point (value 0) set on creation - 3 seconds
>>> in the past - and the end point is three seconds in the future (value 1) -
>>> so it will immediately jump to 0.5, and ramp from 0.5 to 1 over the next 3
>>> seconds, which is why it's not smooth enough.
>>> 
>>> I really need to write an explanatory article about how to use the
>>> scheduler.
>>> 
>>> On Wed, Aug 20, 2014 at 9:43 AM, Chinmay Pendharkar <notthetup@gmail.com> wrote:
>>>> Hello,
>>>> 
>>>> You can look at using the exponentialRampToValueAtTime or setTargetAtTime methods
>>>> instead.
>>>> 
>>>> Human perception of loudness is logarithmic in nature, so exponential
>>>> decays of loudness feel 'smoother' to us than linear decays.
>>>> 
>>>> -Chinmay
>>>> 
>>>> 
>>>> On Wed, Aug 20, 2014 at 10:29 PM, Yehonathan Sharvit <viebel@gmail.com> wrote:
>>>> 
>>>>> Hi,
>>>>> 
>>>>> What is the best way to fade sound in and out?
>>>>> 
>>>>> I tried to achieve that by calling linearRampToValueAtTime (see a demo:
>>>>> 
>>>>> http://jsfiddle.net/viebel/9La05fg5/7/
>>>>> ) on a gain node but the effect
>>>>> was not smooth enough?
>>>>> 
>>>>> How could I make it smoother?
>>>>> 
>>>>> Thanks,
>>>>> Yehonathan.
>> 
>> 
>> 
>> 
>> 
>> 
>>