Glad you found something that works for you.

Personally, I’m massively impressed by Spectrasonic’s Keyscape. Pricy yes… but you aren’t paying for a piano, you’re paying for incredible emulations of almost every electro-acoustic keyboard you might ever want: Clavinets, Rhodes, Wurlitzers, a really good acoustic piano, Pianets, toy pianos, B3, CP70’s, you name it…

Once you factor in how many keyboards are exquisitely sampled, you end up thinking of the piano as a bargain!

It’s amazing how low latency is getting! I use the SWAM modeled instruments, and can get a bombproof 3ms from my old iPad! Admittedly, it’s one voice but modeled not sampled, so a fair bit of CPU used… we live in great times 😎

Remember, latency isn’t a two way trip when you’re using audio drivers. Only the output latency should count because there’s no audio coming in, just going out. That ‘total round trip’ latency simply refers to audio coming in, being processed and then going out. So you ought to get a respectable latency one way…
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An arranger is just a tool. What matters is what you build with it..!