Hi @Jarod.romankiw ,
Welcome to the forums! I think you can do what you’re asking in balenaSound.
You will need to force the audio output to the headphone jack, rather than let auto-detect do it for you. Use the AUDIO_OUTPUT variable, described here: https://sound.balenalabs.io/docs/customization
As for the logo, the balena logo will already show up on the screen when HDMI is connected, since balenaOS runs headless by default. I suspect you may be able to change it, but I’ve never tried myself.
BTW, audio from the HDMI port is much higher quality than the headphone jack. I would recommend you use that instead, and pull the audio signal from your TV somehow.
EDIT: Here’s a post on changing the logo (splash screen): Remotely Change Splash Image