JamTrip fails to get Jack server running on Windows with ASIO4ALL

[Bill van Melle]

I'm trying to help a friend get running with JamTrip on her Windows 10 machine. When we try to connect to the Stanford loopback server, it fails thusly:

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** C:\Program Files (x86)\Jack\jackd.exe -d portaudio -d ASIO::ASIO4ALL v2 -o 2 -p 256 -r 48000

jackdmp 1.9.11

 . . .

** C:\Users\16508\AppData\Local\Programs\jamtrip\resources\resources\bin\win32\jacktrip.exe -n 2 -z -q 4 -b 16 -r 1 -C jackloop256.stanford.edu

JackEngine::ClientCloseAux wait error ref = 2

Setting buffers to zero when underrun...

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Driver is not running

CheckRes error

JackWinNamedPipeClientChannel read fail

Cannot open jackloop256.stanford.edu client

JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

ERROR:

Maybe the JACK server is not running?

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So I tried to do the whole thing manually: I launched qjackctl, configured it for 256/48000, and ran jacktrip from the command line. It worked! Except she got lots of white noise, and I realized that I forgot to configure ASIO::ASIO4ALL v2 as the Interface. Once I did that, it failed even from the command line. The qjackctl messages window shows

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JACK server starting in realtime mode with priority 10

self-connect-mode is "Don't restrict self connect requests"

13:48:54.627 JACK connection change.

13:48:54.630 Statistics reset.

13:48:54.736 Client activated.

13:48:54.741 Patchbay deactivated.

JackEngine::ClientActivate wait error ref = 2 name = qjackctl

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That last line seems suspiciously similar to the second line I quoted above from the JamTrip log, a line that does not appear when I run JamTrip on my own PC. qjackctl status is as though the server is running, and the ASIO icon appears in my system tray, but jacktrip can't see a server.

So JamTrip and the manual approach are consistent here.

Has anyone run into this failure before? Any ideas on things to try?

        Bill