javascript – Tone.js help on structure

I have a music app which is used to compose music, I can have up to 3 instruments playing and I have 2 effects available, pitch change and reverb.

I’m currently using the standard web audio API but I’m having issues sometimes when playing too many notes at once, audio gets messed up. Plus I liked some features that tone.js offers.

I wanted to try and use tone.js to address those issues (if possible) and have all features I previously had.
The issue is that I quickly went through the docs but I don’t really understand how I should structure things.
I have 21 audio files, one for each note, for all 3 instruments, my questions are:

what should I look into to achieve what I want? So to have 3 instruments play together, have reverb and possibility to higher the pitch, loading from audio files.
Is performance something I should worry about?
is there some sort of tutorial/start guide to do something similar from what I want to do?

Any suggestions are welcome too. The website is: here