That didn't seem to make a difference
pi@raspberrypi:~/Downloads $ jackd -d alsa -p 4096 -n 4
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|4096|4|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 4096 frames (85.3 ms), buffer = 4 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 4 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 4 periods for playback
then....
pi@raspberrypi:~/Downloads $ ./stereo_tool_gui_jack_pi2
Thimeo Stereo Tool 9.90 (for Linux with Jack) (C) Thimeo Audio Technology, 2001-2022
jack_client_new: deprecated
Segmentation fault