I have received mine today and I can confirm that I have the issue of the whistle changing when power is cycled. Doing the reset procedure does indeed cure the issue, but it comes back after multiple power cycles, I think I did 6 before the issue returned again.
I have also found that pressing the reset button causes the engine to cycle through it's whistle functions. So it almost seems like the AUX1 function gets constantly sent to the sound card with the issue that we're describing (even when the AUX1 button has not been touched)
Edit:
Today I went to do a quick test of the engine, after running it all day yesterday at my local club, and I discovered that the issue of the whistle changing does appear to be board level. I didn't have the tether set up correctly when I set the engine up on my track, so I got the sounds starting up and the whistle blowing constantly (which was the whistle I had set yesterday). Upon correctly connecting the tether and starting the engine up, I found that the whistle changed as soon as I activated it. So it seems to me that the main control board is sending the sound card the command to switch the whistle/horn when using it for the first time, after a power cycle. Today I will confirm how many power cycles it take for the whistle changing bug to come back, after a hard reset.
Edit 2:
I have been able to pinpoint exactly what causes the issue of the whistles/horns changing with power cycles on the AC-12s, and it's primarily not from cycling the power.
I discovered that if you never go past the 5th whistle/horn in the selections, you will never have the issue of the whistle changing with power cycles. As soon as you go past the 5th selection, thus having it loop back to the 1st selection, the issue will happen constantly until you do a soft reset. Seems like the code for changing whistle/horn gets stuck in a loop of constantly sending a command to change the whistle/horn, after the selection menu loops around.
So if need to go back to a whistle you skipped, right now your best bet is to do a soft reset by putting the engine into program; inputting the same ID it already has; pressing set; setting the engine back to run; and then setting the whistle to what you now want. Doing a soft reset gets you back to whistle/horn selection #1, and also clears out the power cycle whistle/horn change bug.
Long term fix is to send it in for the ROM update, assuming the new ROM doesn't have this bug present. Dave, can you confirm the bug is non-existent in that ROM?
I hope my discovery of the cause of this bug/issue is helpful
