Re: single sample delay from buffer; please help

>So you basically want a single sample feedback delay that is NOT
>buffer based... is this it (sorry - just skimming the thread)?
>
>If it is, this would be fairly easy to build as a UGen. I could
>probably build one quickly based on Delay1. Or - is more flexibility
>wanted?
>
>Another option would be versions of Delay1, Delay2, DelayN, L and C
>with a feedback component.
>
>Have you tried a CombN or AllpassN with a delay of one sample? Of
>course, these have a color to them, but maybe this would work at such
>a small delay time???
>
>Best,
>
>Josh
>
>
>On May 15, 2008, at 9:03 AM, Wouter Snoei wrote:
>
>>  Well, what I'm doing is writing into a buffer with RecordBuf, and
>>  read out immediately after that. This is why the startpos for PlayBuf
>>  is below zero. The same thing could be done by giving RecordBuf a
>>  positive offset and PlayBuf no offset. However, giving PlayBuf a
>>  positive offset makes the read pointer go before the write pointer,
>>  and results in a delay as big as the size of the buffer. Which works
>>  but is not what I want :-).
>>
>>  The bottom line is: as soon as I try to read from and write to a
>>  buffer frame within the timespan of a control frame (64 samples)
>>  thing become unstable, resulting in the distortion. This seems to go
>>  for any UGen I tried to achieve it with. The working example I gave
>>  earlier was probably a lucky exception. Or was it.. ?
>>
>>  cheers,
>>  Wouter
>>
>>
>>  Op 15-mei-2008, om 17:35 heeft nonprivate het volgende geschreven:
>>
>>>  hi wouter, i must admit i don't understand, but if startPos is -1
>>>  then
>>>  the "distortion" is apparent, but if it is set to 1 it isn't. i never
>>>  tried giving startPos negative values before, so i wonder if it's an
>>>  intentional thing in order to do something specific, or something
>>>  you're
>>>  not supposed to do but sounds interesting anyway.
>>>
>>>  Wouter Snoei wrote:
>>>>  I copied the code from Tap.ar. PlayBuf has loop:1 here, so
>>>>  startOffset is wrapped internally. Using .wrap has no effect on
>>>>  result.
>>>>
>>>>  It seems to be something to do with when the buffer is updated. In
>>>>  the first example this always happens straight away, in the second
>>>>  it
>>>>  seems to sometimes wait for a control frame duration. I want to use
>>>>  this for internal single-sample feedback, but there is no way I can
>>>>  get that to work. As soon as I try to route the delayed into the
>>>>  recordbuf the same distortion problems start showing up as in the
>>>>  second example. Really, can't SC do single-sample feedback? The
>>>>  example in the examples folder only does it at Demand rate. As soon
>>>>  as I mix in audio signals there again the same problems as in the
>>>>  example below start showing up.. help welcome here..
>>>>
>>>>  cheers,
>>>>  Wouter
>>>>
>>>>
>>>>  Op 15-mei-2008, om 17:04 heeft nonprivate het volgende geschreven:
>>>>
>>>>
>>>>>  startPos in the PlayBuf is negative, is it supposed to be like
>>>>>  that?
>>>>>  interesting effect to play with, using different values.
>>>>>
>>>>>  Wouter Snoei wrote:
>>>>>
>>>>>>  Hi all,
>>>>>>
>>>>>>  can any of you explain why:
>>>>>>
>>>>>>  b=Buffer.alloc(s, 128, 1);
>>>>>>
>>>>>>  (
>>>>>>  SynthDef(\tryDelay, {|bufnum, delay = 1|
>>>>>> var source, capture, delayed;
>>>>>> source= SinOsc.ar( SinOsc.ar(2).range(400,500), 0, 0.125 );
>>>>>> capture = RecordBuf.ar( source, bufnum );
>>>>>>
>>>>>> delayed = PlayBuf.ar(1, bufnum, 1, 0,
>>>>>> (delay/SampleRate.ir) * SampleRate.ir.neg,
>>>>>> 1);
>>>>>>
>>>>>> Out.ar(0, delayed);
>>>>>>
>>>>>> }).send(s);
>>>>>>  )
>>>>>>
>>>>>>  x=Synth(\tryDelay,[\bufnum, b]);
>>>>>>
>>>>>>  /*
>>>>>>  works but
>>>>>>  */
>>>>>>
>>>>>>  (
>>>>>>  SynthDef(\tryDelay, {|bufnum, delay = 1|
>  >>>>> var source, capture, delayed;
>>>>>> source= SinOsc.ar( SinOsc.ar(2).range(400,500), 0, 0.125 );
>>>>>> capture = RecordBuf.ar( source, bufnum );
>>>>>>
>>>>>> delayed =  PlayBuf.ar(1, bufnum, 1, 0,
>>>>>> delay.neg,   // simplified
>>>>>> 1);
>>>>>>
>>>>>> Out.ar(0, delayed);
>>>>>>
>>>>>> }).send(s);
>>>>>>  )
>>>>>>
>>>>>>
>>>>>>  x=Synth(\tryDelay,[\bufnum, b]);
>>>>>>
>>>>>>  /*
>>>>>>  doesn't work? I get distorted sound with the second one.. Buffer
>>>>>>  size
>>>>>>  doesn't seem to matter, although at <64 samples I get distorted
>>>>>>  sound
>>>>>>  on both examples.
>>>>>>  */
>>>>>>
>>>>>>
>>>>>>  cheers & thanks,
>>>>>>  Wouter
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>  Wouter Snoei
>>>>>>
>>>>>>  info@...
>>>>>>  http://www.woutersnoei.nl
>>>>>>
>>>>>>  _______________________________________________
>>>>>>  sc-users mailing list
>>>>>>  sc-users@...
>>>>>>  http://lists.create.ucsb.edu/mailman/listinfo/sc-users
>>>>>>
>>>>>>
>>>>>>
>>>>>  _______________________________________________
>>>>>  sc-users mailing list
>>>>>  sc-users@...
>>>>>  http://lists.create.ucsb.edu/mailman/listinfo/sc-users
>>>>>
>>>>
>>>>  Wouter Snoei
>>>>
>>>>  info@...
>>>>  http://www.woutersnoei.nl
>>>>
>>>>  _______________________________________________
>>>>  sc-users mailing list
>>>>  sc-users@...
>>>>  http://lists.create.ucsb.edu/mailman/listinfo/sc-users
>>>>
>>>>
>>>
>>>  _______________________________________________
>>>  sc-users mailing list
>>>  sc-users@...
>>>  http://lists.create.ucsb.edu/mailman/listinfo/sc-users
>>
>>  Wouter Snoei
>>
>>  info@...
>>  http://www.woutersnoei.nl
>>
>>  _______________________________________________
>>  sc-users mailing list
>>  sc-users@...
>>  http://lists.create.ucsb.edu/mailman/listinfo/sc-users
>
>******************************************
>/* Joshua D. Parmenter
>http://www.realizedsound.net/josh/
>
>"Every composer - at all times and in all cases - gives his own
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