GTR_RO wrote:I looked at Presonus but something concerned me - that I can't use external plugins. I'm not sure what those are, but suspect they are like Analog Lab and Aria Player and a collection of instruments I have that require Kontrol Player. If that's true then Presonus is out.
You are correct - external plugins include those things you mention. However I wouldn't rule out Presonus Studio One just yet because you can choose from three versions. The most basic is Studio One Prime, which does not support 3rd part plugins. The mid-range version is Studio One Artist, which you can buy an add-on for which does allow you to use 3rd party plugins, and the most advanced version is Studio One Professional which allows you to use 3rd party plugins as standard.
There is a comparison chart of the versions here: https://www.presonus.com/products/Studi ... e-versions
I moved to Studio One Pro relatively recently (prior to that I used Reaper) and it's working happily with all my 3rd party plugins and virtual instruments.