Hey people! I haven't had Respiro for a super long time, but I'd be happy to chime in on this topic!
My top 3 instruments so far have been "Sound of Mother Earth", "Pedro PanPipe III" and "Funky Synth 02".
It's wonderful how Respiro instruments have their own voices, and aren't just copies of existing instruments! If I were to suggest anything new, it would be cool to see some more tuned percussion-type sounds. I use a lot of Marimba/Vibraphone and Mbira type sounds on Mixcraft, but they aren't nearly as responsive in a dynamic sense as Respiro is. It'd be great to see what instruments Rudy could come up with along that line of thought!