Well, these were a request by Jean Piche for the
software his group are building for OLPC, but I reckon
he'll also use them in modules for the new Cecilia we are
working on at the moment (by the way, I am in Canada at
the moment, so hello, good morning, Iain...)

It will be interesting to see what people make with
them.

Victor

>
> Wicked cool! I'm curious as to how you are using these
> kind of things. Are you or students of yours making
> Ableton live type rigs in csound? And if so, is this code
> up anywhere? One of my long range goals has been to rig up
> something like that in tandem with my sequencing set up.
>
> Thanks
> Iain
>
> Victor Lazzarini wrote:
> > I have added a couple of new opcodes to
> > csound CVS, which might of use to some of
> > you. The two are basically loopers: syncloop, a
> > variable-loop-point version of syncgrain; and
> > flooper2, a variable-loop-point crossfade looper
> > with 3 looping modes.
> >
> > SYNCLOOP:
> >
> > A variation on syncgrain allowing for loop points to be
> > set, as well as sound start position
> >
> > asig  syncloop kamp, kfreq, kpitch, kgrsize,
> > kprate,kloopstart, kloopend, ifun1, ifun2, iolaps [,
> > istart]
> > INIT
> >
> > ifun1: source signal function table. Deferred-allocation
> > tables are accepted.
> > ifun2: grain envelope function table.
> > iolaps: maximum number of overlaps,
> > max(kfreq)*max(kgrsize). istart - start position (in
> > secs), defaults to 0.
> > PERFORMANCE
> >
> > kamp: amplitude scaling
> > kfreq: frequency of grain generation, or density, in
> > grains/sec.
> > kpitch: grain pitch scaling (1=normal pitch, < 1 lower,
> > > 1 higher; negative, backwards)
> > kgrsize: grain size in secs.
> > kprate: grain pointer rate, in relation to grainsize.
> > The value of 1 will advance the reading pointer 1 grain
> > ahead in the source table.Larger values will
> > time-compress and smaller values will time-expand the
> > source signal. Negative values will cause the pointer to
> > run backwards and zero will freeze it.
> > kloopstart - loop start point (in secs)
> > kloopend - loop end point (in secs)
> >
> > =========
> > FLOOPER2
> >
> > asig flooper2 kamp, kpitch, kloopstart, kloopend,
> > kcrossfade, ifn [, istart, imode, ifenv]
> >
> > Function-table crossfading looper with variable loop
> > parameters and
> > different looping modes.
> >
> > INIT
> >
> > ifn - sound source function table. Non-power-of-two and
> > deferred allocation
> > tables are allowed.
> > istart - playback starting point in secs, only
> > applicable to loop modes 0 & 2 [def:0]
> > imode - loop modes: 0 forward, 1 backward, 2
> > back-and-forth [def: 0]
> > ifenv - if non-zero, crossfade envelope shape table
> > number. 0, the default, sets
> > the crossfade to linear.
> >
> > PERFORMANCE
> >
> > kamp - amplitude scaling
> > kpitch - playback pitch ratio (1 - normal, > 1 faster, <
> > 1 slower). Negative
> > ratios are not allowed.
> > kloopstart - loop start point (secs). Note that although
> > k-rate, loop parameters
> > such as this are only updated once per loop cycle.
> > kloopend - loop end point (secs), updated once per loop
> > cycle.
> > kcrossfade - crossfade length (secs), updated once per
> > loop cycle and limited to
> > loop length.
> >
> > Victor Lazzarini, 2006
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