Is this the 'right' way to do a log curve? [Yes]

[Relaxnow]

I dont know the “correct” way, but perhaps you can use something from these posts

Basic log

Logarithms in Sonic Pi?

live_loop :test_log_in_ruby do tick puts "x=", look, "log(x)=", Math.log(look) sleep 1 end

@Amiika translated functions from https://easings.net/ to Sonic Pi here
Little fading library