As the title of the topic reads, do you know if it’s possible to use the Raspiaudio ESP Muse Mn Cast to transmit audio from an old receiver or stereo to WiFi or Bluetooth speakers?
With esphome? Don’t think so
Might want to try *ware which is optimized for that use case like this one here maybe
The ESP Muse MN Cast runs Squeezelite…
And now you want to try esphome or why did your topic end up in this section?
ESPHome
This category is for everything about ESPHome. Topics do not have to be Home Assistant related.
Still think that esphome isn’t the right *ware for what you want to achieve without writing a (custom) component for it yourself