--- On Mon, 11/22/10, Claude Heiland-Allen claudiusmaximus@goto10.org wrote:
From: Claude Heiland-Allen claudiusmaximus@goto10.org Subject: Re: [PD] Simple Subtractive Synth filter envelope To: pd-list@iem.at Date: Monday, November 22, 2010, 11:09 PM On 22/11/10 21:48, samuel rowe wrote:
an envelope generator with ADSR
vline~ is your friend here:
"1 10, 0.5 100 10, 0 1000 2000" | [vline~] | [*~][osc~ 666] | [dac~]
the output will not feed into the argument for a
filter cutoff value.
right. you can't connect signal outlets to message inlets: http://www-crca.ucsd.edu/~msp/Pd_documentation/x2.htm#s4.2
Big problems with the text you are quoting:
- 3rd paragraph, sentence one contradicts 3rd paragraph, sentence
two. 2. The whole section is outdated because it doesn't mention the automatic conversion from float to signal. 3. The last paragraph/sentence of that section doesn't specify that the leftmost inlet of an abstraction cannot take both messages and audio (which is implied by paragraph 2, last sentence). 4. It is generally confusing to read in the first sentence that an xlet is either _for_ x or y, with y xlets accepting x some of the time. It might be clearer to just name the xlets: say xlets are _either_ control or signal xlets, then explain the difference (and that they are visually distinct).
Here's a first attempt at a revision:
'There are two types of inlets and outlets in Pd: control and signal. Control inlets only accept messages, just as control outlets only output messages. Signal inlets accept audio, and may also accept messages; signal outlets, however, only output audio. Thus, it's an error to connect a signal outlet to a control inlet; usually this error is detected when the user tries to make the connection with the mouse (which will be prevented). Otherwise it is detected at "sort time" when audio is started or the network changed with audio running.
For convenience, float messages arriving at a signal inlet will be converted to audio. Additionally, an object's leftmost signal inlet may accept other messages as well. Signal inlets/outlets, as well as signal connections, are visually distinct from control inlets/outlets.'
-Jonathan
and most of pd's filters (lop~, hip~, bp~, ...) expect messages for the parameters. the workaround is to use the "raw filter objects" to build more complex filters from poles and zeros.
I made a resonant low pass filter using that method: http://lists.puredata.info/pipermail/pd-list/2007-11/056858.html [PD] pd filter with pole and zero Sat Nov 24 19:00:13 CET 2007
There are also externals with more filters (iemlib has many) and some abstractions out there somewhere.
Good luck!
Claude -- http://claudiusmaximus.goto10.org
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-
Jonathan Wilkes