“I’ve seen similar issues with audio and performance on newer macOS builds — sometimes switching to lower buffer sizes or updating audio drivers can help stabilize playback in Finale 27. Also, make sure any third-party plugins are fully compatible with macOS 12. <a href="https://ropeheroviceapk.com/"> Learn more </a> from others who’ve found workarounds that improve stability without waiting for official patches.”

That is not the issue with Tahoe. Apple made some fundamental changes in macOS 26 and the Finale code is incompatible.

That said, there are possible 3rd party solutions in the works that involve writing translators between Finale and Tahoe. I wish I could say more... Anyway, that's what I'm waiting on.

Thanks for sharing your testing experience. Running beta systems on an external SSD is a smart way to experiment without affecting the main setup. GUI issues like missing menu items are pretty common in early beta versions, so it makes sense to wait for a few more updates before relying on it. Looking forward to seeing your guide once things become more stable.

Your link doesn't work but it doesn't matter. Apple's instructions are good.

You can create as many APFS Volumes on a USB 4 external as you need for each macOS from Mojave to Tahoe (actually High Sierra but 27 requires Mojave). It's easy and takes a few seconds per Volume, not counting installing a different macOS on each one (average 22 minutes). For example, one of my 2012s runs Mojave; the other Catalina, my wife's 2013 runs Big Sur, Catalina & Tahoe — so that's five Volumes.

https://support.apple.com/en-gb/guide/disk-utility/dskua9e6a110/mac 

How you select the boot Volume depends on whether you are on an Intel or ARM Mac.

note that it's all or none in terms of allowing the system to boot from external drives

That does not apply to Intel Macs made before the T1 chip. All Intel Macs with a T1 or T2 chip and all ARM Macs require the Security modifications made in the Repair/Recovery partition before it will allow booting from an external drive.  Again, Apple Support docs tell us how.

https://support.apple.com/en-gb/102518 

I am still waiting on (oops, there's an NDA) before I post exactly how to make an external drive that will boot any Mac made between 2012 and 2026 and run Finale 27 from it. It requires a USB 4 external and cable adapters for 2012–2016 Macs that do not have TB3/4/5 ports. I made that drive a couple years ago and just added a Tahoe volume. Works great but I am not allowed to discuss Finale over Tahoe.

The latest (fourth) beta of macOS 26.4 came out today and I’m running it. Doubtful the os is going to change much from here and you’ve been threatening to post your instructions for almost a year now. Not sure what you’re waiting for. Oh, and I’m not sure how prevalent Macs prior to 2017 are at this point. That’s a long time in computer years. But best of luck to you. Other than smart shapes not working correctly and some minor UX inconveniences, it does work under Tahoe. But i think trying to keep a notation app running with no support or development after nearly two years since it was declared unsupported is questionable. Just my $0.2. My biggest regret was not leaving Finale behind sooner once it was clear around 2023-2024 that bugs weren’t being addressed and the updates were lame.