What about this:
Someone has tries?

I use a x5000. Work very well.
View my diy project in session’s forum

This set caught my attention:
Any comparison with the Katana?

Good. It’s a complete kit. Price?

Look this
€82 complete kit.

Has anyone solved this problem?
I have X5000 and also only the left channel works

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]

X5000 now are discontinued.

The new card are x400:

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