I recommend using clyp.it instead of vocaroo, which preserves the quality better. While both websites apply some processing to make the files smaller, clyp is much less noticeable than vocaroo.
After you do this, make sure to also press the RESET and P2P3 buttons as well.
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P2P3 and P1P4 are the same in terms of envelope shape, with only the exact placement of the points being different. This is only important if you plan to edit the envelopes in detail. However, for general usage, both will sound the same. Crossfading is necessary to blend the overlaps between the notes.
Thanks for sharing my guide!
For OTOing, you may want to refer to this guide as well:
https://utaforum.net/resources/cv-otoing-guide.269/
It includes a detailed explanation of the OTO windows, which will be helpful if you're not 100% familiar with it yet. The OTOing instructions are also specifically geared towards CV Japanese voicebanks. However, I will be editing a section soon. Please check the discussion page for more
updated information:
https://utaforum.net/threads/cv-otoing-guide.14768/
Other than that, I think the next most important thing to consider is mixing. If you are matching up the UTAU vocals and the instrumental together using Audacity, I recommend using proper music software. There are many options available, and you can find a list of free software in this resource:
https://utaforum.net/resources/songwriting-resources.181/
The resource also contains many effects that you can use while mixing. The most important ones for basic vocal mixing are compression, equalization, and reverb. Compression is usually not necessary for UTAU vocals, and is more common when mixing human vocals. You can read about equalization here:
https://utaforum.net/resources/mixing-tutorial-equalization.48/
As for reverb, you'll want to add just a slight amount, enough to hear the effect and make it blend with the song, but not so much that it sounds like your UTAU is deep inside a cave.
There are various mixing guides linked here:
https://utaforum.net/resources/music-theory-mixing-musicianship-resources.141/
Or you could do a google search for "how to mix vocals" and find advice that you can apply to UTAU. Good luck with your future work!