QSynth presenting many errors

Support Software & Applications
1

I updated my system today after having problems to start QSynth.
Running on a Fujitsu Esprimo with Intel i-5, 12 GB ram.
Jack is not giving any errors.

After update I am still getting as before:

22:15:05.980 Qsynth1: Creating synthesizer engine...
22:15:05.989 Qsynth1: Creating audio driver (jack)...
22:15:06.006 Qsynth1: Creating MIDI router (alsa_seq)...
22:15:06.006 Qsynth1: Creating MIDI driver (alsa_seq)...
22:15:06.008 Qsynth1: fluid_synth_set_reverb_on(1)
22:15:06.008 Qsynth1: fluid_synth_set_chorus_on(1)
22:15:06.009 Qsynth1: Synthesizer engine started.
22:15:06.010 Qsynth1: fluid_synth_set_gain(1)
22:15:06.010 Qsynth1: fluid_synth_set_reverb(0.2,0,0.5,0.9)
22:15:06.010 Qsynth1: fluid_synth_set_chorus(3,1,0.3,8,0)
ALSA lib pcm_dsnoop.c:566:(snd_pcm_dsnoop_open) unable to open slave
ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
Cannot lock down 107341340 byte memory area (Kan inte allokera minne)
Cannot lock down 107341340 byte memory area (Kan inte allokera minne)
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib pcm_a52.c:1001:(_snd_pcm_a52_open) a52 is only for playback
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
Cannot lock down 107341340 byte memory area (Kan inte allokera minne)
fluidsynth: error: requested set value for setting 'synth.midi-channels' out of range
fluidsynth: warning: Requested audio-channels to high. Limiting this setting to audio-groups.
fluidsynth: Connection of Midi Through Port-0 succeeded
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 1 [bank=0 prog=1]
fluidsynth: warning: No preset found on channel 2 [bank=0 prog=2]
fluidsynth: warning: No preset found on channel 3 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 4 [bank=0 prog=4]
fluidsynth: warning: No preset found on channel 5 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 6 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 7 [bank=0 prog=7]
fluidsynth: warning: No preset found on channel 8 [bank=0 prog=8]
fluidsynth: warning: No preset found on channel 9 [bank=128 prog=9]
fluidsynth: warning: No preset found on channel 10 [bank=0 prog=10]
fluidsynth: warning: No preset found on channel 11 [bank=0 prog=11]
fluidsynth: warning: No preset found on channel 12 [bank=0 prog=12]
fluidsynth: warning: No preset found on channel 13 [bank=0 prog=13]
fluidsynth: warning: No preset found on channel 14 [bank=0 prog=14]
fluidsynth: warning: No preset found on channel 15 [bank=0 prog=15]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 1 [bank=0 prog=1]
fluidsynth: warning: No preset found on channel 2 [bank=0 prog=2]
fluidsynth: warning: No preset found on channel 3 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 4 [bank=0 prog=4]
fluidsynth: warning: No preset found on channel 5 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 6 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 7 [bank=0 prog=7]
fluidsynth: warning: No preset found on channel 8 [bank=0 prog=8]
fluidsynth: warning: No preset found on channel 9 [bank=128 prog=9]
fluidsynth: warning: No preset found on channel 10 [bank=0 prog=10]
fluidsynth: warning: No preset found on channel 11 [bank=0 prog=11]
fluidsynth: warning: No preset found on channel 12 [bank=0 prog=12]
fluidsynth: warning: No preset found on channel 13 [bank=0 prog=13]
fluidsynth: warning: No preset found on channel 14 [bank=0 prog=14]
fluidsynth: warning: No preset found on channel 15 [bank=0 prog=15]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 1 [bank=0 prog=1]
fluidsynth: warning: No preset found on channel 2 [bank=0 prog=2]
fluidsynth: warning: No preset found on channel 3 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 4 [bank=0 prog=4]
fluidsynth: warning: No preset found on channel 5 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 6 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 7 [bank=0 prog=7]
fluidsynth: warning: No preset found on channel 8 [bank=0 prog=8]
fluidsynth: warning: No preset found on channel 9 [bank=128 prog=9]
fluidsynth: warning: No preset found on channel 10 [bank=0 prog=10]
fluidsynth: warning: No preset found on channel 11 [bank=0 prog=11]
fluidsynth: warning: No preset found on channel 12 [bank=0 prog=12]
fluidsynth: warning: No preset found on channel 13 [bank=0 prog=13]
fluidsynth: warning: No preset found on channel 14 [bank=0 prog=14]
fluidsynth: warning: No preset found on channel 15 [bank=0 prog=15]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 1 [bank=0 prog=1]
fluidsynth: warning: No preset found on channel 2 [bank=0 prog=2]
fluidsynth: warning: No preset found on channel 3 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 4 [bank=0 prog=4]
fluidsynth: warning: No preset found on channel 5 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 6 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 7 [bank=0 prog=7]
fluidsynth: warning: No preset found on channel 8 [bank=0 prog=8]
fluidsynth: warning: No preset found on channel 9 [bank=128 prog=9]
fluidsynth: warning: No preset found on channel 10 [bank=0 prog=10]
fluidsynth: warning: No preset found on channel 11 [bank=0 prog=11]
fluidsynth: warning: No preset found on channel 12 [bank=0 prog=12]
fluidsynth: warning: No preset found on channel 13 [bank=0 prog=13]
fluidsynth: warning: No preset found on channel 14 [bank=0 prog=14]
fluidsynth: warning: No preset found on channel 15 [bank=0 prog=15]
fluidsynth: warning: Failed to set thread to high priority

I don’t understand most of this message. Will be grateful for help!

2

I am not familiar with qtractor so I do not understand most of the messages

But one of the messages I recognise from JACK message logs
Cannot lock down 107341340 byte memory area (Kan inte allokera minne)

I have seen this before when a system has not been configured for realtime scheduling to set memlock (maximum size of address space that can be locked into memory) to unlimited

One simple way to configure system on Arch systems is to install package realtime-privileges

pamac install realtime-privileges

and add user to realtime group

sudo gpasswd -a $USER realtime

reboot system to ensure realtime group membership is loaded

If qsynth is still not working as expected, I suggest you ask for help from either LinuxMusicians forum or qsynth | rncbc.org

3

@nikgnomic : Sounds great@ I will try as soon as i am back at the computer in question. And return of course.

But many thanks anyway, for a suggestion that sounds well founded indeed.