External sound card advice - DJ Mixing using MIXXX

[JasonSpinney]

I'm trying my hand at music mixing using MIXXX on MINT 18.3.
I need to get the sound to split between speaker output and headphones output for cueing and beat matching purposes.
I have bought an external 7.1 sound card - don't think it's compatible driver wise so no matter what I do, I get both decks in both channels in phones and speakers.

Can anyone suggest an external sound card that is compatible with MINT, will split the channels as per the headphones and master button on MIXXX and so will allow isolation of each deck whilst I'm getting the beats matched? Do I just need a splitter cable? Help very much appreciated.
Jason

[Hoser Rob]

Why don't you post what make/model sound card?

You also need to post more info ... you should always do this when asking support questions ... copy/paste this to the terminal and copy/paste the text output here:

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inxi -Fxz

Also plug in the external card, which I'm assuming is USB, and do the same thing with this:

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lsusb

I've never used mixxx and this is the first time I've seen it mentioned here AFAIK. Did you istall it from standard repos or did you add a ppa? If the latter, if you have trouble with ppa software for which there's a repo version, uninstall the program, remove the ppa from your sources list, and reinstall.

[JasonSpinney]

Rob Hi, Thanks for reply. I'm not using the external card now, gave up. Hoping to get a DJ controller that MIXXX advises will work with their software - Numark.
MIXXX is from the official MINT software store. Appreciate your time but not sure there's much to do really.
Terminal output here: $ inxi -Fxz
System: Host: Stelvio-MINT Kernel: 4.13.0-41-generic x86_64 (64 bit gcc: 5.4.0)
Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3)
Distro: Linux Mint 18.3 Sylvia
Machine: System: CLEVO (portable) product: W54xEU
Mobo: CLEVO model: W54xEU v: D02
Bios: American Megatrends v: 4.6.5 date: 08/02/2013
CPU: Dual core Intel Core i5-3380M (-HT-MCP-) cache: 3072 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 11573
clock speeds: max: 3600 MHz 1: 1219 MHz 2: 1293 MHz 3: 1213 MHz
4: 1281 MHz
Graphics: Card: Intel 3rd Gen Core processor Graphics Controller
bus-ID: 00:02.0
Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa)
Resolution: 1366x768@59.98hz
GLX Renderer: Mesa DRI Intel Ivybridge Mobile
GLX Version: 3.0 Mesa 17.0.7 Direct Rendering: Yes
Audio: Card Intel 7 Series/C210 Series Family High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture v: k4.13.0-41-generic[/color][/b]
Network: Card-1: Intel Centrino Wireless-N 135[/color]
driver: iwlwifi bus-ID: 02:00.0
IF: wlp2s0 state: up mac: <filter>
Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 v: 2.3LK-NAPI port: e000 bus-ID: 03:00.2
IF: enp3s0f2 state: down mac: <filter>
Drives: HDD Total Size: 480.1GB (16.3% used)
ID-1: /dev/sda model: SanDisk_Ultra_II size: 480.1GB
Partition: ID-1: / size: 425G used: 58G (15%) fs: ext4 dev: /dev/sda1
ID-2: swap-1 size: 17.05GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 52.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 222 Uptime: 26 min Memory: 2514.1/15915.0MB
Init: systemd runlevel: 5 Gcc sys: 5.4.0
Client: Shell (bash 4.3.481) inxi: 2.2.35