I'm using the c++ api and embedding CSound into a software application. I have been attempting to pass a control parameter to Csound under a channel named "param1", but it is returning 0. However reading the string channel is fine, with the oscillator it also returns expected values over time.

Furthermore if I read csound->GetChannel("param1"), I see the value I set.

It's unclear to me what I am doing wrong?

// csound->SetControlChannel("param1", (MYFLT)0.5);

csound->SetChannel("param1", (MYFLT)0.5);

csound->PerformKsmps();

char tmp_string[4096] = { 0 };
csound->GetStringChannel("stringChannel", tmp_string);

my csd file is something like the following

<CsoundSynthesizer>
  <CsOptions> </CsOptions>
  <CsInstruments>
      sr = 44100 ; samplerate
      ksmps = 512 ; number of samples per control period
      nchnls = 2 ; number of I/O channels
   
      instr 1
        kParam chnget "param1"

      ; kParam oscil 1000, 1
      SText sprintfk "param1(\"%d\")", kParam
      chnset SText, "stringChannel"

      endin
  </CsInstruments>
  <CsScore>
      i1 0 10000 ; switch on instrument 1 for 10000 seconds
      ; f0 z ; run for 7000 years?
      e
  </CsScore>
</CsoundSynthesizer>

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