Audio output via two devices

Hi,

my Linux box has two audio-devices, a on-board analog one and the graphics card (via HDMI). Due to some limitations of my connected amplifier I would like to use both, the analog and the HDMI audio channel.

Since in Kodi’s settings I only can choose one output exclusively, my question: is there a possibility to configure Kodi/Ubuntu to use both, the analog and the HDMI audio output in parallel and without switching them manually?

Thanks!