Share 'Boosting high frequencies (treble boost)'

I'm a refugee from CD Spin Doctor, which no longer works for Macs using the Leopard operating system. Fortunately, Audacity is miles ahead. I use it to record old cassettes and vinyl onto CD. But with all the features in Audacity, I can't find a way to boost the treble on recordings that are too bass-heavy. CD Spin Doctor featured a Sound Enhancer with an Exciter that allowed treble boost. I've…