tone

[1]	tone down , temper , modify , reduce , moderate , modulate , soften , quiet(en) , dampen , dull , subdue , mute , soft-pedal
[2]	tone up , (re)invigorate , tune (up) , brighten (up) , (re)vitalize , freshen (up) , limber up , get into condition/shape
[3]	chant , intone
[4]	inflect , modulate
[5]	tone up , strengthen

[1]	tone of voice , sound , note
[2]	stress , emphasis , force , accent , intonation , modulation , phrasing , inflection , pitch , tonality , timbre , sound (colour) , tone colour/quality , colour/colouring , resonance , sonorousness , sonority , fullness , richness
[3]	manner , timbre , style , timber , attitude , quality , air , aspect , approach , note , tenor , tone of voice , mode of expression , temper , vein , spirit , air
[4]	tint , spirit , feel , tinge , shade , feeling , flavor , hue , colour , flavour , look , colouring , cast , smell
[5]	shade , tint , tincture
[6]	note , musical note
[7]	pure tone
[8]	tonicity , tonus
[9]	whole tone , step , whole step