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I have two speakers. The first one is connected to a PCI card and the second one via Bluetooth. Sounds are played a little bit earlier on the PCI card so I want to add some latency. I downloaded the pulse audio GUI and I have this :

As you can see, I added offset of 2 seconds on the "Audio Interne" (the PCI card).

I checked with the command pactl list cards and I have this for the internal card :

Card #1

        Name: alsa_card.pci-0000_00_1b.0

        Driver: module-alsa-card.c

        Owner Module: 8

        Properties:

                alsa.card = "0"

                alsa.card_name = "HDA Intel PCH"

                alsa.long_card_name = "HDA Intel PCH at 0xf7f10000 irq 27"

                alsa.driver_name = "snd_hda_intel"

                device.bus_path = "pci-0000:00:1b.0"

                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"

                device.bus = "pci"

                device.vendor.id = "8086"

                device.vendor.name = "Intel Corporation"

                device.product.id = "1e20"

                device.product.name = "7 Series/C216 Chipset Family High Definition Audio Controller"

                device.form_factor = "internal"

                device.string = "0"

                device.description = "Audio interne"

                module-udev-detect.discovered = "1"

                device.icon_name = "audio-card-pci"

        Profiles:

                input:analog-stereo: Entrée Stéréo analogique (sinks: 0, sources: 1, priority: 65, available: yes)

                output:analog-stereo: Sortie Stéréo analogique (sinks: 1, sources: 0, priority: 6500, available: yes)

                output:analog-stereo+input:analog-stereo: Duplex stéréo analogique (sinks: 1, sources: 1, priority: 6565, available: yes)

                output:analog-surround-21: Sortie Surround analogique 2.1 (sinks: 1, sources: 0, priority: 1300, available: yes)

                output:analog-surround-21+input:analog-stereo: Sortie Surround analogique 2.1 + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 1365, available: yes)

                output:analog-surround-40: Sortie Surround analogique 4.0 (sinks: 1, sources: 0, priority: 1200, available: yes)

                output:analog-surround-40+input:analog-stereo: Sortie Surround analogique 4.0 + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 1265, available: yes)

                output:analog-surround-41: Sortie Surround analogique 4.1 (sinks: 1, sources: 0, priority: 1300, available: yes)

                output:analog-surround-41+input:analog-stereo: Sortie Surround analogique 4.1 + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 1365, available: yes)

                output:analog-surround-50: Sortie Surround analogique 5.0 (sinks: 1, sources: 0, priority: 1200, available: yes)

                output:analog-surround-50+input:analog-stereo: Sortie Surround analogique 5.0 + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 1265, available: yes)

                output:analog-surround-51: Sortie Surround analogique 5.1 (sinks: 1, sources: 0, priority: 1300, available: yes)

                output:analog-surround-51+input:analog-stereo: Sortie Surround analogique 5.1 + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 1365, available: yes)

                output:iec958-stereo: Sortie Stéréo numérique (IEC958) (sinks: 1, sources: 0, priority: 5500, available: yes)

                output:iec958-stereo+input:analog-stereo: Sortie Stéréo numérique (IEC958) + Entrée Stéréo analogique (sinks: 1, sources: 1, priority: 5565, available: yes)

                off: Éteint (sinks: 0, sources: 0, priority: 0, available: yes)

        Active Profile: output:analog-stereo

        Ports:

                analog-input-front-mic: Microphone avant (priority: 8500, latency offset: 0 usec, available)

                        Properties:

                                device.icon_name = "audio-input-microphone"

                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-21+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-41+input:analo

g-stereo, output:analog-surround-50+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo

                analog-input-rear-mic: Microphone arrière (priority: 8200, latency offset: 0 usec, not available)

                        Properties:

                                device.icon_name = "audio-input-microphone"

                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-21+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-41+input:analo

g-stereo, output:analog-surround-50+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo

                analog-input-linein: Entrée ligne (priority: 8100, latency offset: 0 usec, available)

                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-21+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-41+input:analo

g-stereo, output:analog-surround-50+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo

                analog-output-lineout: Sortie ligne (priority: 9900, latency offset: 2000000 usec, available)

                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-21, output:analog-surround-21+input:analog-stereo, output:analog-surround-40, output:analog-surround-40+inp

ut:analog-stereo, output:analog-surround-41, output:analog-surround-41+input:analog-stereo, output:analog-surround-50, output:analog-surround-50+input:analog-stereo, output:analog-surround-51, output:analog-surround-51+input:analog-stereo

                analog-output-headphones: Casque audio (priority: 9000, latency offset: 2000000 usec, not available)

                        Properties:

                                device.icon_name = "audio-headphones"

                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo

                iec958-stereo-output: Sortie numérique (S/PDIF) (priority: 0, latency offset: 0 usec)

                        Part of profile(s): output:iec958-stereo, output:iec958-stereo+input:analog-stereo

And I tried to do pactl play-sample bell.ogg alsa_output.pci-0000_00_1b.0.analog-stereo. It always seems instantaneous. The latency I set doesn't seems to change anything, even when I play music.

What can I do?

EDIT

With pactl list sinks, I see this :

Latency: 2039815 usec, configured 40000 usec 

So it seems the latency is set correctly but it seems to be instantaneous when I play a sound. I suppose there should be a delay. Is there something I don't understand?