Down loading soundcard ???

The easy way, no soldering.

Recordable Buttons, Dog Training and Communication Buttons, Set of 6 Assorted Colored Buzzers, 30-Second Recording

https://www.amazon.com/Recorda...teries/dp/B091M91HWQ

Again, key with this style, microphone direct audio recording and then up to 30 second playback, one sound per button.

An alternative is similar style button, but different function and electronics that uses MP3s you transfer, and thus one button can play multiple sounds, one after the other in a sequence.

https://www.amazon.com/RIBOSY-...rdings/dp/B0825NJJ6Q

The alternative and using your ERR fatboy speaker concept- sounds like you want one unit per building or accessory.

I say this because there are MP3 "trigger boards" where they have a bunch of button inputs, you record sound files and name them in storage so they correspond to a button press, however the catch 22 is, one speaker output from the board. So the sound would not be localized to the building. Again, just such a board with multiple trigger inputs but only outputs to one speaker https://www.amazon.com/DEVMO-V...atible/dp/B09L4QM1PN

So if you want individual boards- one per building, this is the cheapest thing I know of and when bought in bulk, the price really goes down. This has a built in amplifier to connect to your ERR fatboy speaker. https://www.amazon.com/AITRIP-...coding/dp/B09DYBFHPL

Now, also, this could run off of the 4.5V typical Menards 5V building power. You also need to store the MP3 or audio on a USB stick or small microSD card (called a TF card in some countries). Also, these are not "trigger" boards and begin playing as soon as power is applied. A work around on that at our local club is we use arcade style big red buttons and a time delay relay board with multiple channels for controlling motorized action accessories. So, if an accessory was powered- then the sound module was powered kind of setup. Example for a sawmill, a button press fires the time delay relay channel, then an MP3 module is powered with sawmill sounds- but so is a smoke unit, lights, and action at the sawmill for a set time by the time delay relay module. Yes, more complicated, more parts- but we wanted all of our public actuated button based accessories on timers- so they start and run for several seconds or a fixed time rather than momentary.

8 channel time delay relay

Again, my point is, you can go as simple or as complicated as you want. You can have multiple boards, individual sounds and action from a building or you can have one speaker and common ambient sounds.

giant red arcade microswitch style lighted buttons

Vernon ,Thanks for through response. Will shoot you a message via email with a couple more ??s.

UnclePeteRR