FM-able, synchable sample playback? (was: Re: [sdiy] Voltage-Controlled Sampler?)

[S. Kuehnl]

Hi Martin,

--- Martin Fay <martin at manikin.force9.co.uk> schrieb:
> >This reminds me: in VAZ Modular I can apply
> >exponential FM to existing sound files up to a
> quite
> >large index (8 oct?)
> 
> Only 4 octaves, stacking both FM inputs.

For the records, or other VAZ users here, there's a
workaround: feed the "4-input mixer" into the pitch
input, then FM carrier to mixer channel 1; then feed
the normal "note high" or your other pitch of choice
at full index into channel 2 AS WELL AS into channel 3
at index 1. The osc's will still track very reasonably
and can be FMed over the full range (at 44K sample
rate, this is 8 octaves before they start to get
scratchy, right?). The "FM inputs" are only useful for
vibrato.

Thanks for making VAZ so limited, it's fun coming up
with these tricks! :-)

> >Is there any synth, hard or soft, that allows
> *linear*
> >FM of an arbitrary soundfile (as opposed to small
> >wavetables of fixed proportions as in the Wiard and
> >other modules)? Or even of live input (a minimal
> delay
> >while it's written to a file wouldn't matter)?
> 
> I've been thinking about this while I've been
> working on the Sine
> Oscillator (i.e. Yamaha FM/PM) module on the latest
> VazMod. I can see
> at least a couple of potential problems... Through
> zero will
> complicate the algorithm as it will have to deal
> with a playback index less than zero.

It doesn't have to be through zero FM, the linear FM
as some modular VCOs (Buchla 258-C, Wiard/ Blacet,
MOTM) would be terrific already. A large enough index
is much more important.

But as I said, a slight delay wouldn't even be a
problem, so why not add BOTH FM types :-)

> Also a constant modulation index
> will be problematic
> if the pitch of the source sample is varying.

Why is the index dependant on pitch? I never noticed
that the linear FM index of two VCOs changed when they
were controlled by independent pitch sources??

If I'm ignorant of common knowledge here, I'd still
appreciate a private reply. But anyway, VAZ Modular
already has MANY non-constant features, long before if
you push its boundaries, and that's what analog
modulars are loved for as well - hey, even your
filters don't have constant tracking (index 116
approximates it for a few octaves) - so why worry
about FM indeces.

Not sure if I'm sounding like it, but I love using VAZ
Modular and would like to encourage you to add this.

Sebastian Kuehnl



	

	
		
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