How Do Use A MIDI Controller with LMMS?

  Kernel: 6.5.0-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 13.2.1 Desktop: GNOME v: 44.3
    Distro: Manjaro Linux base: Arch Linux
  Type: Laptop System: LENOVO product: 82B5 v: Lenovo Legion 5 15ARH05 serial: <superuser required>
  Mobo: LENOVO model: LNVNB161216 v: SDK0J40688 WIN serial: <superuser required>
    UEFI-[Legacy]: LENOVO v: EUCN19WW date: 05/12/2020
  ID-1: BAT0 charge: 42.4 Wh (100.0%) condition: 42.4/60.0 Wh (70.7%) volts: 17.0 min: 15.4
    model: Celxpert L19C4PC0 status: full
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    rev: 1 cache: L1: 512 KiB L2: 4 MiB L3: 8 MiB
  Speed (MHz): avg: 1443 high: 1660 min/max: 1400/2900 boost: enabled cores: 1: 1398 2: 1640
    3: 1400 4: 1400 5: 1400 6: 1607 7: 1660 8: 1400 9: 1397 10: 1400 11: 1400 12: 1400 13: 1400
    14: 1397 15: 1397 16: 1397 bogomips: 92664
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
  Device-1: NVIDIA TU117M [GeForce GTX 1650 Ti Mobile] vendor: Lenovo driver: nvidia v: 535.98
    arch: Turing bus-ID: 01:00.0
  Device-2: AMD Renoir vendor: Lenovo driver: amdgpu v: kernel arch: GCN-5 bus-ID: 05:00.0
    temp: 47.0 C
  Device-3: Chicony Integrated Camera driver: uvcvideo type: USB bus-ID: 1-3:2
  Display: x11 server: v: with: Xwayland v: 23.1.2 driver: X:
    loaded: amdgpu,nvidia dri: radeonsi gpu: amdgpu resolution: 1920x1080~120Hz
  API: OpenGL Message: Unable to show GL data. Required tool glxinfo missing.
  Device-1: NVIDIA driver: snd_hda_intel v: kernel bus-ID: 01:00.1
  Device-2: AMD ACP/ACP3X/ACP6x Audio Coprocessor vendor: Lenovo driver: N/A bus-ID: 05:00.5
  Device-3: AMD Family 17h/19h HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel
    bus-ID: 05:00.6
  Device-4: AKAI Professional M.I. MPK mini 3 driver: hid-generic,snd-usb-audio,usbhid type: USB
    bus-ID: 3-2:9
  API: ALSA v: k6.5.0-1-MANJARO status: kernel-api
  Server-1: sndiod v: N/A status: off
  Server-2: JACK v: 1.9.22 status: off
  Server-3: PipeWire v: 0.3.77 status: active
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  IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter>
  Device-2: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel bus-ID: 04:00.0
  IF: wlp4s0 state: down mac: <filter>
  Device-1: Intel AX200 Bluetooth driver: btusb v: 0.8 type: USB bus-ID: 3-3:3
  Report: rfkill ID: hci0 rfk-id: 3 state: up address: see --recommends
  Local Storage: total: 476.94 GiB used: 362.37 GiB (76.0%)
  ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLB512HBJQ-000L2 size: 476.94 GiB temp: 43.9 C
  ID-1: / size: 459.72 GiB used: 362.37 GiB (78.8%) fs: ext4 dev: /dev/nvme0n1p1
  ID-1: swap-1 type: partition size: 8.8 GiB used: 0 KiB (0.0%) dev: /dev/nvme0n1p2
  System Temperatures: cpu: 59.6 C mobo: N/A gpu: amdgpu temp: 47.0 C
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  Processes: 388 Uptime: 17m Memory: total: 16 GiB note: est. available: 15 GiB
  used: 6.3 GiB (42.0%) Init: systemd Compilers: gcc: 13.2.1 clang: 15.0.7 Packages: 1746
  Client: gnome-shell v: 44.3 inxi: 3.3.28

I recently got hold of an AKAI MPK Mini Mk3. I plug it in, it lights up and seems to work. I open LMMS and select it as a MIDI device. I can see it works but there’s no audio. After looking around for a fix and tried different settings, I finally got the audio to work, but now the controller doesn’t show on the list of devices anymore. I’ve been scouring the internet for weeks now trying to figure out how to get this thing to work. Nothing.