[chuck-users] Fwd: hotswapping UGens

[Kassen]

Forward of a old message for Andrew to illustrate a technique related to his
question.

Please note that this technique is squarely in the "powertools can maim"
category; it's very powerful, getting around some of ChucK's limitations but
it runs right next to the edge of where the VM will crash because of the
casting.

Kas.

---------- Forwarded message ----------
From: Kassen <signal.automatique at gmail.com>
Date: 21 January 2009 16:14
Subject: hotswapping UGens


Fellow ChucKists,

Inspired by Scott's explanation of casting I thought I'd try a new trick
that may be quite interesting for livecoding.

first run this file;
-----------------------------
new UGen @=> Foo.instrument;
public class Foo
    {
    static UGen @instrument;
    spork ~attach();

    fun void attach()
        {
        while(1)
            {
            if(!instrument.isConnectedTo( dac )) instrument => dac;
            second => now;
            }
        }
    }

Foo foo;
new Sitar @=> foo.instrument;

//your melody goes here
while(second => now) 1 => (foo.instrument $ Sitar).noteOn;
--------------------------------------------

Then run this to hot-swap the UGen while the original code runs;

--------------
new Shakers @=> Foo.instrument;
-----------------------

Sadly this does need that "attach" function as assignment breaks the link to
the dac. I'm not sure I feel that's desirable behaviour but at least we can
now hotswap UGens without crashing. I don't think I succeeded in that
before.

Yours,
Kas.
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