[PD] looking for an ADSR external

[matthew jones]

well I'm no expert on this, I think vline~ is able to generate ramps who's 
start and end times can be sub-sample accurate.  This I think, is quite 
similar to the iemlib [t3_line~]...

It also has the added functionality of sending 'delayed' messages, ie. tell 
it to start ramping a second after it receives the message.  Therefore it 
allows you to queue up lots of ramp commands, so you do not have to use many 
'sub-sample accurate' [delay] blocks sending messages to the [vline~] in 
order to use its accuracy functionality.

BTW: I'd second Tim's suggestion that a table lookup is a much better way of 
computing the log~/exp~ functions.  In fact, I _think_ this is how Miller 
has chosen to compute the [mtof~] and [ftom~] functions (which are also 
logarithmic/exponential functions) when dealing with signals, shown in 
several of his examples... On loadbang, calculate and fill a high precision 
array with the precomputed [log] and [exp] functions for the range of values 
required (these can then use the control blocks for calculation, instead of 
audio!).  Then just read and optionally interpolate the values (like feeding 
the [vline~] into a [tabread4~]).

Hope this is, well, at least semi-accurate and of some help.
Regards,

Matt

-=-=-=-=-=-=-=-=-=-=-=-
http://www.loopit.org
-=-=-=-=-=-=-=-=-=-=-=-
----- Original Message ----- 
From: "Federico" <xaero at inwind.it>
To: "matthew jones" <mj at isvr.soton.ac.uk>
Sent: Wednesday, January 05, 2005 1:02 PM
Subject: Re: [PD] looking for an ADSR external


> On Wed, 5 Jan 2005 12:02:47 -0000
> "matthew jones" <mj at isvr.soton.ac.uk> wrote:
>
>> But why not make your own abstraction with [vline~]??
>
> i already made one (that outputs messages).
> and making another (see my post asking for log~ exp~ objects)...
>
> but i used line~.
>
> what's the difference between [line~] and [vline~]?