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Hello. I'm wondering why, in the example below, instead of the expected notes, I end up playing a note that's about a fourth too low, and then a minor third too low. What can I do to get the desired pitches in both cases?

Here's the code:

<CsoundSynthesizer>
<CsOptions>
-odac
</CsOptions>

<CsInstruments>

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

opcode onepole_allpass, a, ai
    ain, icoef xin
    aX1 init 0
    aY1 init 0
    aout = icoef * (ain - aY1) + aX1
    aX1 = ain
    aY1 = aout
    xout aout
endop

instr 1
    iFreq mtof p4
   
    iDelay = 1 / iFreq

    aEnv expon 1, 0.01, 0.0001
    aExc rand 0.5
    aExc = aExc * aEnv

    abuf delayr 0.1
    aTap deltapi iDelay

    ; without Allpass I get the correct pitch
     ;aLoop = aTap

    ; with Allpass: to low
    aLoop onepole_allpass aTap, -0.3
    delayw aExc + 0.999 * aLoop

    out aTap * 0.5
endin

</CsInstruments>

<CsScore>
i 1 0 3 69
i 1 + . 69
e
</CsScore>
</CsoundSynthesizer>

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Hi Stefan,
for me it also worked setting the ksmps to 1. You could do that locally. But I 
am very sure that Victor's solution is systematically a lot better. Still, it 
might serve as a workaround, if you have many other issues to solve with your 
code/piece.

Best wishes,

Jeanette

--
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Hi Stefan,
I had the same issue with deltapn. A look at the manual helps. Delaytime in 
samples. So, set:
iDel = 1 / iFreq * sr

That works very well and it answered one of my own unasked questions. I knew 
that there was a delay opcode with a delay time in samples.

Best wishes,

Jeanette

--
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * GitHub: https://github.com/jeanette-c

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here