There is one game that has a very hidden sound test mode, the Hyperslide. I am on a mission to try and find the full sound test mode for this game. Let's see if any of my online electronic experts will help me figure it out!
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https://www.youtube.com/watch?v=ZphambF-tMU
Back in 2017 I uploaded a video trying to re-create the 8-bit style Japanese Air Raid siren. Now my MIDI programmer gblpro made me this sound and I exported using virtual instruments, and now it includes professional Japanese voiceover! Enjoy!
I reuploaded as there was some audio at the end that shouldn't be there.
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https://www.youtube.com/watch?v=ZObRFATeq7g
After the Brain Shift fried out, I put fresh batteries in the game today and it's working again! Alright OK!
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https://www.youtube.com/watch?v=R79rzND7GXY