suptronics x5000 mono sound

I install volumio on rpi 3 with suptronics x5000. I have problem because I have only mono sound. Left chanel works fine on right no working.

volumio@volumio:~$ amixer
Simple mixer control ‘PCM’,0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback -10239 - 400
Mono: Playback 400 [100%] [4.00dB] [on]

Has anyone had such problem?