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Audio through 3.5mm Jack instead of HDMI #8

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@FabianEllenberger

Hi there, first of all thank you for the library!

I'm playing a audio file with node-aplay. My Pi has an HDMI cable connection and speakers on the 3.5mm jack. The problem is that the audio from node-aplay will be played through HDMI and i would like to play the audio over the 3.5mm headphone jack. The HDMI should only display the RaspberryPi on a Screen but not the audio form node-aplay.

Do you by any chance know how to achieve this? I already configured the Pi to only play audio through the jack with amixer cset numid=3 1, but i assume that ALSA is somehow overwriting this config because as soon as i connect a HDMI cable the audio will be played through that.

I'm using resin.io by the way.

Thank you!

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