I understand the process (if not all the technical stuff) as I use Metasynth on my Mac and the end results are amazing. To be able to apply a similar - though in reality probably a cut down - process in real time with in a modular system would be wonderful. david David Salter Senior Consultant PSG Reuters Messaging: david.salter.reuters.com@reuters.net (t) +44 (0)20 7542 2402 | (m) 07990562402 | (f) 52699 Get the latest news at Reuters.com <http://www.reuters.com/> ________________________________ From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] On Behalf Of Richard Scott Sent: 07 March 2008 15:39 To: Doepfer_a100@yahoogroups.com Subject: Re: [Doepfer_a100] Re: granular processor & generato seriously, the fact that ideas and designs get hammered out on this list and that doepfer actually listen to users needs and builds a fair prortion of what we discuss is great. Part of loving modulars is the playing and the sound, but part is the planning, thinking, design... its great that we can be involved in this aspect too BTW I have no real idea what they are talking about either! Richard ----- Original Message ----- From: David Salter To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com> Sent: Friday, March 07, 2008 3:32 PM Subject: RE: [Doepfer_a100] Re: granular processor & generato D&G, How about you guys getting together, producing a spec and building it so the rest of can enjoy the pleasures of granular synthesis in a modular :o) David Salter Senior Consultant PSG Reuters Messaging: david.salter.reuters.com@reuters.net <mailto:david.salter.reuters.com%40reuters.net> (t) +44 (0)20 7542 2402 | (m) 07990562402 | (f) 52699 Get the latest news at Reuters.com <http://www.reuters.com/ <http://www.reuters.com/> > ________________________________ From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com> ] On Behalf Of Denis Gökdag Sent: 07 March 2008 14:11 To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com> Subject: Re: [Doepfer_a100] Re: granular processor & generato > > grains are not fixed samples, they are bits of samples put togheter or > more correctly: a long sample is smashed into smaller samples > (grains). > > grains parameters (position, pitch, lenght, density and dynamics) > should > be controllable independently from those of the main sample (loop > points, > pich/speed, direction...) well i do not see where this is any different from what i wrote, sorry if i made my points in a too involved or technical way; i've been thinking about making a grain module for quite a while but so far have been lacking the time and infrastructure to do, hence the dsp-nerd-style ;-) it i will use the term "source file" instead of "sample" from now on to make clearer what i am saying. there are two main differences between what you wrote and what i wrote: a) you introduce the idea of selecting between multiple "source files" *per voice*, while i was suggesting using one source file per voice. your approach would be more "intuitively shaping semi-random results", while mine would be more "constructivist". i do like the idea of selecting a source file per CV, but it could be done by switching/fading between the individual outputs of the voices with an a152 or 144/135 combo for example....lowering the strain on the DSP and giving more acces to what happens with every single grain. b) you're more into "meta attributes", like "density" and "dynamics" (which are not clearly defined, and could technically be interpreted as "average # of grains started per time unit"/"average amount of grains overlapping at any given time" and "amplitude envelope within a grain"/"time varying amplitude scaling of whole grains".....so we're basically talking about statistics and sequencer- like terms here), i'm more into "discrete control" and leaving as many functions outside the module as possible, again lowering the workload on the DSP and giving access to every single grain. call me a control freak but i much prefer to be able to process every single grain independently in my a100 and leave the random/statistic distribution stuff to other dedicated modules :-) I may be wrong, but i believe it is important to leave the processor load as low as possible if you want to both have realtime control of all parameters at audio rate (where it maakes sense) *and* a good audio quality. In the module i proposed, we're already lloking at the following operations per grain: - evaluate all A/D inputs and write their values to memory (to have the data needed for all following operations) - read from memory location in source file specified by input parameters - perform real-time interpolating sample rate conversion (for the transposition) - create from input parameters and read from two look-up tables for the fade curves - multiply sample values with that data for the fades - possibly crossfade into next grain (which means that all the above operations will have to be executed *before* the next grain arrives, which might be 1/samplerate seconds later only...AND for the following grain as well.) - write audio to D/A buffer, write data to control output buffers. I think this already is quite a lot of work for a DSP, especially if you take into account that the sample rate would probably have to be at least 88.2khz or higher to avoid aliasing when performing audio- rate FM on the grains, as the sidebands introduced will easily go above the nyquist frequency on most material. And you probably don't want such a module to have a latency of more than 10ms (and even that would be a lot for a module in an analog setup). > > - a cv lag processor for the position pointer would allow to smooth > the > transition of granulation travelling thru the long sample simply use a lag processor before the cv input. you don't want to switch position while a grain is playing, as that either introduces signal discontinuities aka clicks'npops, OR requires a lot of interpolation going on all the time. > > - a clock/trig input would control the density of grains > > - a gate input would trigger the playback of the grains these two exclude each other. you *either* have a statistical distribution aka "density" (which is more or less random, controllable from a fixed rate to noise sampled at a clock rate specified by "density") OR you trigger an individual grain at a specified point in time. the only way to mix these is to force a grain on grain trigger, overriding the automatic triggering set by the "density" parameter.....but you could simply switch between a controlled trigger source and digital noise (a117) before the trigger input. also no *gate" is required in the setting you describe, just a *trigger* (as the length of the grain is defined by its own parameter) > > - a cv input to control grains pitch > > - a cv input to control main sample's pitch These both affect the same parameter and thus one is redundant. > > - a cv input for atack time of the grains > > - a cv input for the release time of the grains > > - a cv feedback would allow to feed the grains back to themselves What do you want this to do? Overwrite the source file with the output signal? Or just repeat a grain? The latter is what the looped- mode in my suggestion would do, the other would basically pose the question to which location in the source you want to write....or wether you want a grain *processor* (which would be about writing to and reading from the same memory). > > - a cv delay time would allow to delay the signal for grain's feedback Again, this mixes up a processor and a generator.....there is no need for a delay parameter as you have full control of when a grain is started and from which part of the file it is being "grabbed"....and writing to the memory that is being read from is more of a grain *processor" application. Echoes on the grains could be done with an external delay module with greater flexibility. ahw, got awfully dsp-nerdy again ;-) l8a, d This email was sent to you by Reuters, the global news and information company. 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Message
RE: [Doepfer_a100] Re: granular processor & generato
2008-03-07 by David Salter