Use audio output USB device

I have a Roland TD-30 drum connected using USB to my computer. The USB device support MIDI and audio input/output. Currently Linux does see the USB card. aplay -l shows: kaart 2: TD30 [TD-30], apparaat 0: USB Audio [USB Audio] Sub-apparaten: 1/1 Sub-apparaat #0: subdevice #0 When I call cat /proc/asound/card2/*, it shows me: TD30 TD-30 Output 0 Tx bytes : 0 Input 0 Rx bytes : 0 cat: /proc/asound/card2/pcm0c: Is een map cat: /proc/asound/card2/pcm0p: Is een map Roland TD-30 at usb-0000:00:14.0-10, full speed : USB Audio Playback: Status: Running Interface = 0 Altset = 1 Packet Size = 320 Momentary freq = 44100 Hz (0x2c.199a) Interface 0 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 1 OUT (ADAPTIVE) Rates: 44100 Capture: Status: Running Interface = 1 Altset = 1 Packet Size = 320 Momentary freq = 44100 Hz (0x2c.199a) Interface 1 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 2 IN (ASYNC) Rates: 44100 003/017 0582:0158 The midi input/output is working fine, but the audio input/output is not working at all. Alsamixer can only use the midi input/output. Does someone know I can fix this? I'm using Kubuntu 18.10. I got sound out of my usb device by booting Kubuntu with the audio device ON and plugged. Just after boot it works fine, but after a few minutes it stops and a reboot is needed. Can this be solved?