It has been a very long time to reply but the sound with the timmouse v1.30 onwards simply doesn’t work in FS9/FSX with Windows 10 regardless of those ‘tricks’ mentioned.
I’ve been recently trying to reinstall many old retro - classic add-ons such as this one without success.
Such a shame!
I guess since the original posts were 6 years ago, and most of us have moved on to Windows 10, it’s probably quite relevant that he can explain the process.