One suggestion is to have a simple sample playback instrument, with  
say a table reader and a phasor or a line generator, then
have another controller instrument that will trigger it (using event,  
schedule, scoreline, etc) at different starting points. The
controlling instrument will give you the flexibility to do modulate  
the playback start, length, etc, as you wish.

Other opcodes that might be useful are syncgrain, syncloop and  
flooper2. Oeyvind's partikkel might also be what you need, but it  
takes sometime to master.

Victor
On 27 Jul 2011, at 20:27, Austin Stone wrote:

> Hi all!
>
> I am trying to create a sample looper that can read between  
> different points of a sample. I have a large 30" + file that has  
> repeated vocal phrases.
>
> Is there an opcode that reads from different sample points using  
> control signals? I have only seen samplers that use I-rate  
> variables, such as loscil, diskin2 and a Joachim Heintz udo  
> BufPlay1. But they are getting me where I really need to be.
>
> I don't want to use p-field substitutions such as +, ~, or > because  
> I would rather have playback at a fixed amount of time, or instances  
> or repetition.
>
> I have started to experiment with macros to contain each sample read  
> point, but how can I oscillate through each point at a fixed or  
> random rate?
>
> Is there a way to have control signals in the orchestra target  
> macros for play back? Would they be able to reach into the score to  
> do this?
>
> Thanks for your comments!
>
> Austin

Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie





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hi -
what do you exactly mean by "reading from different sample points using
control
signals"? can you give an example?
in general, you have access to a i-variable at k-time via the reinit
opcode. there are examples and decriptions here:
http://en.flossmanuals.net/csound/ch016_a-initialization-and-performance-pass/
best -
	joachim

Am 27.07.2011 21:27, schrieb Austin Stone:
> Hi all!
> 
> I am trying to create a sample looper that can read between different
> points of a sample. I have a large 30" + file that has repeated vocal
> phrases.
> 
> Is there an opcode that reads from different sample points using control
> signals? I have only seen samplers that use I-rate variables, such as
> loscil, diskin2 and a Joachim Heintz udo BufPlay1. But they are getting
> me where I really need to be.
> 
> I don't want to use p-field substitutions such as +, ~, or > because I
> would rather have playback at a fixed amount of time, or instances or
> repetition.
> 
> I have started to experiment with macros to contain each sample read
> point, but how can I oscillate through each point at a fixed or random rate?
> 
> Is there a way to have control signals in the orchestra target macros
> for play back? Would they be able to reach into the score to do this?
> 
> Thanks for your comments!
> 
> Austin


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i do understand better now, and i think what you want to do is certainly
possible, and it is not a question about the opcodes (you can do it even
with soundin), but about the structure of your program.

i would use two instruments; one for triggering, and one for playing the
snippets. actually you could do it within one instrument, but splitting
the task gives you much more flexibility. for instance, you can play as
many snippets at the same time as you like, and regardless your general
time has ended, your subinstrument will finish its snippet without
producing a click.

see a code example below - i hope this helps.

	joachim





sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1

;all possible start- and endpoints
gimarkers ftgen 0, 0, -6, -2, 0, 1.1, 2.5, 3.7, 5.1, 6.3

instr 1 ;trigger instrument
inmarker tableng gimarkers ;number of markers
loop:
indx random 0, inmarker-1 ;index for starting point
istart tab_i indx, gimarkers ;start time
iend tab_i indx+1, gimarkers ;end time
idur = iend-istart ;duration
    timout 0, idur, do
    reinit loop
do:
    event_i "i", 2, 0, idur, istart ;call instr 2
endin

instr 2 ;playing the sections
iskip = p4
aL, aR soundin "myfile.wav", iskip
outs aL, aR
endin



i 1 0 100




Am 28.07.2011 21:27, schrieb Austin Stone:
> I am still working out the wording of the project, so please be patient
> if there is any confusion in what exactly I am trying to do.
> 
> I have a long sample of various vocal takes, and I would like to Csound
> to cycle or randomly shuffle through each take. Ideally I can state the
> end and start times for each take and have csound play through different
> point with in the sample.
> 
> I can't figure out how to choose start and end points, and then have the
> instrument select a new start and end point only after the selection has
> finished.
> 
> For instance:
> selection 1 is st 0" and e 2"
> selection 2 is st 34" and e 37"
> selection 3 is st 100" and e 101.5"
> 
> I want to randomly choose a selection and play it, when it is finished I
> would randomly play another selection.
> This would go on for a duration set in the score, let's say 20" of playback.
> 
> I have gotten close with PlayBuf1
> , using
> randh to switch between selection times, but I cannot feed back the
> selection duration into the frequency of randh at this time.
> 
> Is there a way to make a feed back loop? Have not been successful with
> goto statements :(
> 
> @Victor
> I'm not sure if syncgrain, syncloop, flooper2, partikkel is getting me
> where I need to be in terms of playing each selection in the sample?
> But the table reader looks very promising, would you mind elaborating?
> Any examples?
> 
> 
> 
> On Thu, Jul 28, 2011 at 5:26 AM, joachim heintz  > wrote:
> 
>     hi -
>     what do you exactly mean by "reading from different sample points using
>     control
>     signals"? can you give an example?
>     in general, you have access to a i-variable at k-time via the reinit
>     opcode. there are examples and decriptions here:
>     http://en.flossmanuals.net/csound/ch016_a-initialization-and-performance-pass/
>     best -
>            joachim
> 
>     Am 27.07.2011 21 :27, schrieb Austin Stone:
>     > Hi all!
>     >
>     > I am trying to create a sample looper that can read between different
>     > points of a sample. I have a large 30" + file that has repeated vocal
>     > phrases.
>     >
>     > Is there an opcode that reads from different sample points using
>     control
>     > signals? I have only seen samplers that use I-rate variables, such as
>     > loscil, diskin2 and a Joachim Heintz udo BufPlay1. But they are
>     getting
>     > me where I really need to be.
>     >
>     > I don't want to use p-field substitutions such as +, ~, or > because I
>     > would rather have playback at a fixed amount of time, or instances or
>     > repetition.
>     >
>     > I have started to experiment with macros to contain each sample read
>     > point, but how can I oscillate through each point at a fixed or
>     random rate?
>     >
>     > Is there a way to have control signals in the orchestra target macros
>     > for play back? Would they be able to reach into the score to do this?
>     >
>     > Thanks for your comments!
>     >
>     > Austin
> 
> 
>     Send bugs reports to the Sourceforge bug tracker
>              
>      https://sourceforge.net/tracker/?group_id=81968&atid=564599
>     
>     Discussions of bugs and features can be posted here
>     To unsubscribe, send email sympa@lists.bath.ac.uk
>      with body "unsubscribe csound"
> 
> 


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It might be easier to start by snipping the audio file apart into separate
files, with one take per file. You can do this easily using Audacity. Then
your audio playback instrument could choose a file at random from the list
and proceed with playback.

--Jim Aikin

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<CsoundSynthesizer>

<CsOptions>

</CsOptions>

<CsInstruments>

sr = 44100

ksmps = 32

nchnls = 2

0dbfs = 1

;all possible startpoints

gimarkerstart ftgen 0, 0, -6, -2, 0, 2.9, 5.7, 34, 37.9, 41.8

;the corresponding endpoints (really duration in the example)

gimarkerend ftgen 0, 0, -6, -2, 1, 1, 1, 2, 2, 2

instr 1 ;trigger instrument

inmarker tableng gimarkerstart ;number of markers

ioutmarker tableng gimarkerend ;number of end point markers

loop:

indx random 0, inmarker-1 ;index for starting point

istart tab_i indx, gimarkerstart ;start time

iend tab_i indx, gimarkerend ;end time

idur = iend ;duration, not really using endpoints

timout 0, idur, do

reinit loop

do:

event_i "i", 2, 0, idur, istart ;call instr 2

endin

instr 2 ;playing the sections

iskip = p4

a1 soundin "MYSONG.aif", iskip

outs a1, a1

endin

</CsInstruments>

<CsScore>

i 1 0 100

</CsScore>

</CsoundSynthesizer>