[JACK] Set an arbitrary number of input/output channels (aka ports)

[gvnnz]

While fiddling around with Reaper, I noticed that it allows to create an arbitrary number of I/O channels when using JACK. For example, my sound card has only 2 physical outputs but I can instruct Reaper to create a JACK connection with, say, 8 output channels:

Is it possible to do the same via RtAudio? I tried to set 8 for the RtAudio::StreamParameters::nChannels field while using JACK API, but I got the following error:

RtApiJack::probeDeviceOpen: requested number of channels (8) + offset (0) not found for specified device (system).

[davy7125]

Have you tried option RTAUDIO_JACK_DONT_CONNECT ?
It allowed me to create any number of output channels using Jack with no predefined connections.
Then, a patchbay with qwpgraph or QjackCtl can automatically connect the multiple output channels to what you want.

[gvnnz]

Thanks @davy7125 , the RTAUDIO_JACK_DONT_CONNECT option fixed it. Closing.