I replaced the cortiça virgem ball in my samba whistle with 200 year old reclaimed cortiça amadia. I noticed an immediate change in the timber and responsiveness in the upper-mid-high-piccolo frequencies. I've achieved the tone I've always heard in my head! I used to have to adjust my embouchure to make up for the lack of resonance but now it just SINGS! Ever since I've made the change, other whistleblowers have been approaching me after the show and complimenting me on my tone. That never used to happen!