You can experiment with values or type. Yun lang. As you go higher value mas darker yung tone rolled off tone. Sa cap type, individual preference na lang yan. You can try paper-in-oil, mylar, orange drops (which are mylar still if I'm not mistaken), polypropylene, or ceramic. Just disconnect your current tone cap, and replace with alligator clips, para madali i-test isa2x. FWIW, happy ako sa electronics ng SE ko. You might want to keep it that way if you're happy with how it performs.