So, since you altered your furby to make the lower the pitch of the sound since it hurts your ears, the furby now sings when it is pet.
Here’s a site that might help: https://blog.adafruit.com/2013/01/28/hacksby-hack-a-furby-project/
Here’s another site that may help: https://www.instructables.com/Furby-2012-Taming-via-Arduino-Hack/
Here’s another site that might help: https://poppopret.org/2013/12/18/reverse-engineering-a-furby/
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If you factory reset the furby, then the normal high pitch sound will come back. This may be ideal, because then you could reprogram it properly, having a second chance. But, it could be a bigger risk as some people accidentally re-programmed their Furby to go to sleep right when they wake up.
Here is how to factory reset the 2012 furby: https://youtu.be/_CupuxLYAMY