[chuck-users] help understanding lisa

Kassen signal.automatique at gmail.com
Thu Nov 6 19:33:26 EST 2008


What?!  That's sweet!

The .period( ) one? Yeah I like that one and I should as I wishlisted it it
:¬). It's good for optimising stuff like this and for setting LFO speeds to
match BPM and so on.

> What other methods are there in there undocumented?  ;-)

Hmmm, is that undocumented? I think it was at least in the VERSIONS file, I
think it is in other places too and I used it on the list before as well.

As for other undocumented features; there is a complete list of all
undocumented features, libraries and UGens on the WiKi but I lost the URL
when my bookmarks got lost in a HD format.

Anyway, making the time-advancing of a controler loop a harmonic (or
sub-harmonic) of the pitch is a great trick for good trades in CPU vs
fidelity. As a extra bonus the artefacts of such operations should be
hamonics as well so less objectionable then the less related artefacts
caused by more or less random periods like 10::ms. This is of course without
taking the quantizing effects of the sample-rate into account, at least
rounding errors shouldn't carry like they will in some other systems where
the control rate will be quantised as well and not just it's effects.

>From your other post;

> Here, you'd have to pick something closer to the sample rate for

Yes, I think so. Of course we need to take the context into account when
trying to optimise like this. Personally I'd look into using one of the Gen
UGens or some similar method to generate a envelope. You could also use a
SndBuf to store a wave-table and use that as a arbitarily shaped envelope
with a Gain used as a VCA. In that case, because of the memory usage of the
buffers I'd definitely re-cycle shreds using Events and signalling.

All of these have advantages and disadvantages; we *always* have to trade, I
fear, but there are definitely interesting options open to you.

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