you are likely to find Noise in/at/on Transmission. Noise is the opposite of Tone. Tone is a synonym of Step. Step is related to Ladder. 
Reduction is a type of Change. Lend is a type of Change. 
Transmission <--AtLocation-- Noise <--Antonym--> Tone <--Synonym--> Step <--RelatedTo--> Ladder 
Reduction --IsA--> Change <--IsA-- Lend 