Change csound oscillator frequency while playing one note

Question

I'm using CSound in the context of CSoundUnity to build a synthesizer with Unity. I would like to have the possibility to change the frequency of one note of quasi infinite duration during play-time. Not between notes.

The communication between the Unity C# script and csound is implemented via CSoundUnity "channels".

I implemented the oscillator in the csound-csd-file like this:

instr 1
 kfreq chnget "freq"
 iflg = p4
 asig oscils .7, kfreq, 0, iflg
 outs asig, asig
endin

This leads to a syntax error, because the parameter kfreq for the oscils-oscillator can only be changed per note and not during playing, so it cannot be a control parameter.

The script compiles in this form:

instr 1
 ifreq chnget "freq"
 iflg = p4
 asig oscils .7, ifreq, 0, iflg
 outs asig, asig
endin

but I want to have the possibility to change the frequency during playing.

Is there any possibility to achieve this?

Answer 1

The channel reading at k-rate is fine, you just need to use a different oscillator that accepts k-rate frequency changes. Try oscili or oscil3 for example.