Problem with LV2 plugin DrumSynth preset

Software
1

I had such a problem with LV2 plugins DrumSynth.
I uploaded ds files to Zynthian. I created an assignment of ds files to individual notes in the DrumSynth GUI. I saved the preset. I searched for lv2 presets in webconf. After the restart, I created a snapshot with DrumSynth on the first channel with the created preset. I ran an external sequencer and nothing. The message WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN! => delayed 0.0us

Here is log:

Mar 19 20:46:52 zynthian startx[2315]: [['file:///zynthian/zynthian-my-data/presets/lv2/DrumSynth_DrumSynth_MyClaps.preset.lv2/DrumSynth_MyClaps.ttl', None, 'DrumSynth_MyClaps', 'None'], ['file:///zynthian/zynthian-my-data/presets/lv2/DrumSynth_Owl_Alvarez.preset.lv2/Owl_Alvarez.ttl', None, 'Owl Alvarez', 'None'], ['file:///zynthian/zynthian-my-data/presets/lv2/DrumSynth_TR_808.preset.lv2/TR_808.ttl', None, 'TR-808', 'None'], ['file:///zynthian/zynthian-my-data/presets/lv2/DrumSynth_TR808.preset.lv2/TR808.ttl', None, 'TR808', 'None']]
Mar 19 20:46:52 zynthian startx[2315]: INFO:zynthian_layer.set_preset: Preset selected: Owl Alvarez (1)
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_controller.midi_unlearn: MIDI Unlearn: modulation wheel
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_controller.midi_unlearn: MIDI Unlearn: sustain pedal
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 0 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 1 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 2 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 3 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 4 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 5 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 6 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 7 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 8 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 9 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 10 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 11 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 12 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 13 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 14 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 15 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_audio_recorder.unarm: Channel 256 not armed
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynthian_gui_layer.restore_state_snapshot: Setting curlayer to 0
Mar 19 20:46:53 zynthian startx[2315]: DEBUG:zynthian_gui.set_active_channel: ACTIVE CHAN: -1 => 0
Mar 19 20:46:53 zynthian startx[2315]: INFO:zynseq.restore_riff_data: Restoring RIFF data...
Mar 19 20:46:53 zynthian startx[2315]: ZynCore->setup_behaviour_zyncoder(0, ...): Invalid index!
Mar 19 20:46:53 zynthian startx[2315]: ZynCore->setup_behaviour_zyncoder(1, ...): Invalid index!
Mar 19 20:46:53 zynthian startx[2315]: ZynCore->setup_behaviour_zyncoder(2, ...): Invalid index!
Mar 19 20:46:53 zynthian startx[2315]: ZynCore->setup_behaviour_zyncoder(3, ...): Invalid index!
Mar 19 20:47:38 zynthian startx[2315]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN! => delayed 0.0us
Mar 19 20:47:38 zynthian startx[2315]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN! => delayed 0.0us
type or paste code here

And System and Setup:

HARDWARE

Raspberry Pi 400 Rev 1.1
Audio: Behringer UMC404HD
Display: WaveShare 7 HDMI+USB 1024x600
Wiring: DUMMIES
I2C: Not detected
Profile: encoderless

SYSTEM

Raspbian GNU/Linux 10 (buster)
Build Date: 2024-01-16
Memory: 33% (1272M/3839M)
SD Card: 33% (37G/115G)
Temperature: 51.1ºC
Overclock: None

MIDI

Profile: default.sh
Tuning: 440 Hz
ZS3 (SubSnapShots): On
Preload Presets: On
MIDI to Output: Off
Master Channel: off

SOFTWARE

zyncoder: stable (c452d2b)
zynthian-ui: stable (f19f78c)
zynthian-sys: stable (7a69951)
zynthian-data: stable (5a40e04)
zynthian-webconf: stable (7e74565)

2

Could you share the preset, the audio files and the snapshot?

Thanks

3

Also, be warned that restarting UI sometimes fails. It’s an old issue that we have not managed to fully solve yet.
When facing issues after restarting the UI it’s always recommend a full reboot.

Regards

4

Here is snapshot:
013-DrumSynth.zss (105.7 KB)
and lv2 preset
DrumSynth_Owl_Alvarez.preset.lv2.zip (26.2 KB)
ds files are in /home/pi/zynthian-my-data/files/drumsynth/owl_alvarez
and source is here

No audio sound because no sound from the engine.

I tried restarting, that didn’t help either.

Before first saving the preset and activating it via webconf, DrumSynth was playing.

5

I tested also DrumGizmo, which generated the same warning Mar 19 22:05:59 zynthian startx[1397]: WARNING:zynthian_autoconnect.cb_jack_xrun: Jack Audio XRUN! => delayed 0.0us, but is making sound.
Geokick is playing OK without this message.

6

New observation:
The problem occurs when the LV2 plugin DrumSynth is on channel 1. I took a snapshot where the first is ZynAddSubbFX and the second channel is DrumSynth and the problem is over. So it’s kind of an old bug.
EDIT:
OH nooo
But not. After six minutes it appeared and stopped playing.