[Stk] Multichannel audio, RtAudio, and RtWvOut

[David Michael]

Hello

I have some questions regarding the use of STK for the playback of  
multiple audio channels in realtime. Specifically I am trying to code  
up a panner to handle any number of output channels (similar to the  
NPAN in RTcmix as far as I can tell).

1) Is there a preferred realtime interface (RtAudio or RtWvOut) for  
realtime multichannel audio data?

2) Is getting RtAudio to handle multiple channels in the callback  
function just a matter of writing another sample to the buffer  
pointer like so?:

register StkFloat *samples = (StkFloat *) buffer;

for ( int i=0; i<bufferSize; i++ ) {
     StkFloat xxx = data->instrument->tick();
     *samples++ = xxx; // channel 1
     *samples++ = xxx; // channel 2
}

So for 3 channels it would look like this?:

or ( int i=0; i<bufferSize; i++ ) {
     StkFloat xxx = data->instrument->tick();
     *samples++ = xxx; // channel 1
     *samples++ = xxx; // channel 2
     *samples++ = xxx; // channel 3
}

If someone would like to help clarify this aspect of RtAudio, it  
would be much appreciated. If it is only a matter of adding another  
buffer sample to the pointer var, then I see how I could have the tick 
() return an array or vector. Should I be using RtWvOut instead??

3) I have searched this one out, but are there any tutorials anywhere  
that specifically address the use on STK with multiple realtime  
channels, or alternatively does someone on list have some simple  
example code that they could share?

Thanks in advance for your help
Best
David