Ok so, this will be a bit long.
So, i'm a composer. I write mainly orchestral music, and liturgical Catholic music, mostly in latin and spanish. (I live in México tho.) I have acces to Cantai because i'm paying the Muse Sounds Pro subscription.
This context is pretty much important because, as a professional musician this product is COMPLETELY UNUSABLE.
If you're not a prof, you can end here: Try it. It sounds decent, it Works mostly well in english, the voices are ok. It might help your choir to know what to sing.
But if you're a professional, keep reading.
1. The "voices" are MEEH. Like, meh. There is one soprano that it's barely usable, but it tends to sing like "pop". This definetly does not work if you're doing classical, but for "pop-ish" sounds, it might work. The devs should put a lot more attention into how the sound actually is, as "singing - playing styles" it's one of the most important things we as composers have in account. Specially, because more than one "voice" adds grace notes that are not written anywhere in the score. Specially the men, when going from one note to another. The "baritones" are completely unusable, don't even try. The tenors, there is one that Works well as pop music, but all the other ones just don't work for classical. One even sounds like a woman voice tuned down.
2. In musescore, the processing SUCKS. That's the only way i can describe it. And it's not my computer, i have a pretty beast of a machine as desktop (i7, 32gb ram, 12 gb video dedicated, 2tb ssd etc.), and a MacBook Pro m3 24gb ram, and a pretty much stable 500mbps symmetrical internet connection and IT TAKES FOREVER TO PROCESS, and suddenly it stops and it says "Online sounds are not ready", and you can't do anything with it. Like, anything. Just totally unusable. And real deal here it's that IT WON'T TELL YOU WHY. It just stops, and Good luck finding why it won't process. There is not an error log, or "click here to retry", or "you should change this syllabe, or anything. NOTHING. And there's no offline processing, so either you open the file again or try to move something in the text, but you won't ever know why it won't render. This should be easy to fix: a freaking toggle that lets you "Process offline" or "Process online", because i understand that this processing takes quite a lot of resources, but my brother, i have them, let me use it.
3. The "Choir" mode it's actually 3 or 4 voices of the same "soprano, alto, tenor or baritone" (there is no actual bass.), and it sucks. It sounds pretty awful.
4. The dynamics are PAINFUL. They don't even try. That's the only thing i have to say.
5. About the languages, well, it says clearly that they only support english. It DOES NOT SUPPORT LATIN. Latin does not work as expected. You should have a language option, that you select when selecting the voice in the mixer.
So, conclussion: If you're not a PRO, you should try this. Pretty nice tech, it "Works" within musescore.
If you're a pro, i STRONGLY SUGGEST DO NOT PAY FOR THIS STANDALONE. It's not even close to be worth it the full price. It might be in the future, but not now.
Suggestion to the devs: Check out "cantamus.app". They've been making this kind of synthesis since 2022, and it's pretty stable and predictable.
Thank you, and good luck.
Partner Response: Hi there, thanks for getting in touch with us. Could you please share more details by submitting a support ticket here? Our team will be happy to help: https://support.musehub.com/hc/en-gb/requests/new