Hallo @jofemodo,
In my case I have problem with sound, exactly I have not sound from sfizz engine. I try the same sfz font in Sfizz and LS synt layer. Here is debug log:
Restarting UI in normal mode
-- Logs begin at Mon 2021-08-23 21:17:08 BST. --
Aug 23 21:26:14 zynthian startx[510]: xinit: unexpected signal 15
Aug 23 21:26:14 zynthian systemd[1]: zynthian.service: Main process exited, code=exited, status=1/FAILURE
Aug 23 21:26:14 zynthian startx[510]: Cannot read socket fd = 11 err = Interrupted system call
Aug 23 21:26:14 zynthian startx[510]: Could not read result type = 24
Aug 23 21:26:14 zynthian startx[510]: New instance of zynseq
Aug 23 21:26:14 zynthian startx[510]: **zynseq initialising as zynthstep**
Aug 23 21:26:14 zynthian startx[510]: ***Jackpeak closing***
Aug 23 21:26:14 zynthian systemd[1]: zynthian.service: Failed with result 'exit-code'.
Aug 23 21:26:14 zynthian systemd[1]: Stopped Zynthian User Interface.
Aug 23 21:45:31 zynthian systemd[1]: Started Zynthian User Interface.
Aug 23 21:45:31 zynthian startx[4735]: X.Org X Server 1.20.4
Aug 23 21:45:31 zynthian startx[4735]: X Protocol Version 11, Revision 0
Aug 23 21:45:31 zynthian startx[4735]: Build Operating System: Linux 5.10.17-v8+ aarch64 Raspbian
Aug 23 21:45:31 zynthian startx[4735]: Current Operating System: Linux zynthian 5.10.52-v7l+ #1441 SMP Tue Aug 3 18:11:56 BST 2021 armv7l
Aug 23 21:45:31 zynthian startx[4735]: Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=640 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 smsc95xx.macaddr=E4:5F:01:25:E3:EF vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=tty3 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait logo.nologo quiet splash
Aug 23 21:45:31 zynthian startx[4735]: Build Date: 19 April 2021 03:23:36PM
Aug 23 21:45:31 zynthian startx[4735]: xorg-server 2:1.20.4-1+rpt3+deb10u3 (https://www.debian.org/support)
Aug 23 21:45:31 zynthian startx[4735]: Current version of pixman: 0.36.0
Aug 23 21:45:31 zynthian startx[4735]: Before reporting problems, check http://wiki.x.org
Aug 23 21:45:31 zynthian startx[4735]: to make sure that you have the latest version.
Aug 23 21:45:31 zynthian startx[4735]: Markers: (--) probed, (**) from config file, (==) default setting,
Aug 23 21:45:31 zynthian startx[4735]: (++) from command line, (!!) notice, (II) informational,
Aug 23 21:45:31 zynthian startx[4735]: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
Aug 23 21:45:31 zynthian startx[4735]: (==) Log file: "/var/log/Xorg.0.log", Time: Mon Aug 23 21:45:31 2021
Aug 23 21:45:31 zynthian startx[4735]: (==) Using config directory: "/etc/X11/xorg.conf.d"
Aug 23 21:45:31 zynthian startx[4735]: (==) Using system config directory "/usr/share/X11/xorg.conf.d"
Aug 23 21:45:31 zynthian startx[4735]: ./zynthian.sh: line 55: /sys/class/backlight/*/bl_power: No such file or directory
Aug 23 21:45:31 zynthian startx[4735]: /zynthian/config/img/fb_zynthian_boot.png is 640x480 PNG image, color type GRAY, 8 bit
Aug 23 21:45:31 zynthian startx[4735]: Zooming image by 100%...done
Aug 23 21:45:31 zynthian startx[4735]: Merging...didn't find evidence of prior run.
Aug 23 21:45:31 zynthian startx[4735]: done
Aug 23 21:45:31 zynthian startx[4735]: Building XImage...done
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): warning: Replacing version 2071.7 of <http://gareus.org/oss/lv2/b_whirl#extended> from <file:///zynthian/zynthian-plugins/lv2/b_whirl.lv2/>
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): note: New version 2071.11 found in <file:///zynthian/zynthian-plugins/lv2/b_whirl/>
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): warning: Replacing version 2071.7 of <http://gareus.org/oss/lv2/b_whirl#simple> from <file:///zynthian/zynthian-plugins/lv2/b_whirl.lv2/>
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): note: New version 2071.11 found in <file:///zynthian/zynthian-plugins/lv2/b_whirl/>
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): warning: Ignoring bundle <file:///zynthian/zynthian-plugins/lv2/b_synth.lv2/>
Aug 23 21:45:33 zynthian startx[4735]: lilv_world_load_bundle(): note: Newer version of <http://gareus.org/oss/lv2/b_synth> loaded from <file:///zynthian/zynthian-plugins/lv2/b_synth/>
Aug 23 21:45:34 zynthian startx[4735]: libjackpeak registering as 'jackpeak'.
Aug 23 21:45:34 zynthian startx[4735]: libjackpeak created input ports
Aug 23 21:45:39 zynthian startx[4735]: A dependency job for novnc0.service failed. See 'journalctl -xe' for details.
Aug 23 21:45:39 zynthian startx[4735]: ERROR:zynthian_gui_admin.start_vncserver: Command 'systemctl start novnc0' returned non-zero exit status 1.
Aug 23 21:45:39 zynthian startx[4735]: ERROR:zynthian_engine.start: Can't start engine Sfizz => The command was not found or was not executable: sfizz_jack.
Aug 23 21:46:30 zynthian startx[4735]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN!
Aug 23 21:46:42 zynthian startx[4735]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN!
Aug 23 21:46:42 zynthian startx[4735]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN!
Aug 23 21:46:53 zynthian startx[4735]: ERROR:zynthian_engine.start: Can't start engine Sfizz => The command was not found or was not executable: sfizz_jack