Disable "New Message" Sound without disabling "Voice Message" Sound

[SHU-red]

Current behavior:
If Audio is disabled (to not get an audio notification for each new message), listening to voice messages does not work anymore.

Target behavior:
Disabling notification sound for new messages without loosing the ability to listen to voice-messages

Note:
Hopefully there was not an update in the meantime or i did not notify some settings

Information about my machine:

System:    Kernel: 5.4.0-66-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
           Desktop: Cinnamon 4.8.6 wm: muffin 4.8.1 dm: GDM3 3.36.3, LightDM 1.30.0 
           Distro: Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal 
Machine:   Type: Desktop Mobo: ASUSTeK model: Z170 PRO GAMING v: Rev X.0x serial: <filter> 
           UEFI: American Megatrends v: 3805 date: 05/16/2018 
CPU:       Topology: Quad Core model: Intel Core i7-6700K bits: 64 type: MT MCP arch: Skylake-S 
           rev: 3 L2 cache: 8192 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 63999 
           Speed: 800 MHz min/max: 800/4300 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 
           5: 800 6: 800 7: 800 8: 800 
Graphics:  Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] vendor: Gigabyte driver: nvidia 
           v: 450.102.04 bus ID: 01:00.0 chip ID: 10de:1c03 
           Display: x11 server: X.Org 1.20.9 driver: nvidia 
           unloaded: fbdev,modesetting,nouveau,vesa resolution: 3440x1440~50Hz 
           OpenGL: renderer: GeForce GTX 1060 6GB/PCIe/SSE2 v: 4.6.0 NVIDIA 450.102.04 
           direct render: Yes 
Audio:     Device-1: Intel 100 Series/C230 Series Family HD Audio vendor: ASUSTeK 
           driver: snd_hda_intel v: kernel bus ID: 00:1f.3 chip ID: 8086:a170 
           Device-2: NVIDIA GP106 High Definition Audio vendor: Gigabyte driver: snd_hda_intel 
           v: kernel bus ID: 01:00.1 chip ID: 10de:10f1 
           Sound Server: ALSA v: k5.4.0-66-generic 
Network:   Device-1: Intel Ethernet I219-V vendor: ASUSTeK driver: e1000e v: 3.2.6-k port: f000 
           bus ID: 00:1f.6 chip ID: 8086:15b8 
           IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel Wireless 7265 driver: iwlwifi v: kernel port: e000 bus ID: 03:00.0 
           chip ID: 8086:095a 
           IF: wlp3s0 state: down mac: <filter> 
Drives:    Local Storage: total: 4.55 TiB used: 655.31 GiB (14.1%) 
           ID-1: /dev/nvme0n1 vendor: Western Digital model: WDS100T3X0C-00SJG0 size: 931.51 GiB 
           speed: 31.6 Gb/s lanes: 4 serial: <filter> rev: 111110WD scheme: GPT 
           ID-2: /dev/sda vendor: Western Digital model: WD40EFRX-68WT0N0 size: 3.64 TiB 
           speed: 6.0 Gb/s rotation: 5400 rpm serial: <filter> rev: 0A82 scheme: GPT 
Partition: ID-1: / size: 915.40 GiB used: 298.94 GiB (32.7%) fs: ext4 dev: /dev/nvme0n1p2 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 74 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 60% 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/agornostal-ulauncher-dev-focal.list 
           1: deb http://ppa.launchpad.net/agornostal/ulauncher-dev/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/kritalime-ppa-focal.list 
           1: deb http://ppa.launchpad.net/kritalime/ppa/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/microsoft-edge-dev.list 
           1: deb [arch=amd64] http://packages.microsoft.com/repos/edge/ stable main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http://packages.linuxmint.com ulyssa main upstream import backport #id:linuxmint_main
           2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
           3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/softmaker.list 
           1: deb http://shop.softmaker.com/repo/apt wheezy non-free
           Active apt repos in: /etc/apt/sources.list.d/teamviewer.list 
           1: deb https://linux.teamviewer.com/deb stable main
           2: deb https://linux.teamviewer.com/deb preview main
           Active apt repos in: /etc/apt/sources.list.d/videolan-master-daily-focal.list 
           1: deb http://ppa.launchpad.net/videolan/master-daily/ubuntu focal main
Info:      Processes: 346 Uptime: 3d 21h 42m Memory: 62.76 GiB used: 7.47 GiB (11.9%) 
           Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 8/9 Shell: bash v: 5.0.17 
           running in: gnome-terminal inxi: 3.0.38