rezound with jack seems to fail

[grammoboy2]

JACK was the reason to prefer rezound over audacity ;)

./rezound --audio-method=jack
using path '/home/debian/develop/rezound/share' for share data directory
Notice: You do not have a LADSPA_PATH environment variable set. Defaulting to "/usr/local/lib/ladspa:/usr/lib/ladspa"
using path '/home/debian/develop/rezound/share' for share data directory
jack_client_new: deprecated
Jack: JackClient::SetupDriverSync driver sem in flush mode
Jack: JackLinuxFutex::Connect name = jack_sem.1000_default_rezound
Jack: Clock source : system clock via clock_gettime
Jack: JackLibClient::Open name = rezound refnum = 4
Jack: JackClient::PortRegister ref = 4 name = rezound:output_1 type = 32 bit float mono audio port_index = 7
Jack: JackClient::PortRegister ref = 4 name = rezound:output_2 type = 32 bit float mono audio port_index = 8
Jack: JackClient::Activate
Jack: JackPosixThread::StartImp : create non RT thread
Jack: JackPosixThread::ThreadHandler : start
Jack: JackClient::kBufferSizeCallback buffer_size = 256
Jack: JackClient::Init : period = 5804 computation = 100 constraint = 5804
Jack: JackPosixThread::AcquireRealTimeImp priority = 5
Jack: JackClient::ClientNotify ref = 4 name = rezound notify = 2
Jack: JackClient::kActivateClient name = rezound ref = 4
Segmentation fault

[IGBC]

I get a different error:

[18:36 lauren@edward rezound (dev/qt5)]$ ./rezound --audio-method=jack
using path '/home/lauren/Dev_Local/clones/rezound/share' for share data directory
jack_client_new: deprecated
Cannot lock down 107341338 byte memory area (Cannot allocate memory)
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one
warning -- Cannot connect to JACK port, , please choose a different one

these warnings continue ad-infinitum until you close the program. Clearly something in the jack backend is borked